VISION ITS DEVELOPMENT IN INFANT AND CHILD BY ARNOLD GESELL, M. D. FRANCES L. ILG, M. D. GLENNA E. BULLIS Assisted by VIVIENNE ILG, O. D. and G. N. GETMAN, O. D. PAUL B. HOEBER, INC. MEDICAL BOOK DEPARTMENT OF HARPER i-BROTHERS PREFACE The background, scope, and genesis of the present volume are out lined in an introductory chapter which follows. There is not much more which needs to be said by way of preface. The investigations of the Yale Clinic of Child Development since its founding in 1911 have been mainly concerned with the growth aspects of early human behavior. All told, the behavior characteristics of 34 age levels have been charted, encompassing the first ten years of life. An intensive longitudinal study of a group of five infants in 1927 estab lished methods for a systematic normative survey. These methods in cluded developmental examinations and inventories at lunar month intervals during the first year of life. Concurrent cinema records were analyzed to define significant behavior patterns and growth trends. Special attention was given to the ontogenetic patterning of posture, locomotion, prehension, and manipulation. Cinemanalysis, both of normative and experimental data, demon strated that the eyes play an important role in the ontogenesis of the total action system of the total child. The nature and the dynamics of that role constitute the subject matter of the present study. The adult human eye has been likened to a camera. This analogy has had some truth and much tradition in its favor. But it has tended to obscure the developmental factors which determine the structure and the organization of the visual functions during infancy and child hood. The development ofvision in the individual child is an extremely v PREFACE complex and protracted process for the very good reason that it took countless ages of evolution to bring human vision to its present pre eminence. Our culture is becoming increasingly eye minded with the advancing perfection and implementation of the organ of sight. What is that organ It is more than a dioptric lens and a retinal film. It embraces enormous areas of the cerebrum it is deeply involved in the autonomic nervous system it is identified reflexively and directively with the skeletal musculature from head and hand to foot. Vision is so perva sively bound up with the past and present performances of the organism that it must be interpreted in terms of a total, unitary, integrated action system. The nature of the integration, in turn, can be under stood only through an appreciation of the orderly stages and relativi ties of development whereby the integration itself is progressively at tained. The authors have attempted to achieve a closer acquaintance with the interrelations of the visual system per se and the total action system of the child. This finally entailed the use of the retinoscope and of analytic optornetry at early age levels where these technical procedures ordinarily are not applied. The examinations of the visual functions and of visual skills were really conducted as behavior tests, not only to determine the refractive status of the eyes, but also to determine the reactions of the child as an organism to specific and total test situations. The objective findings have been correlated with the cumulative evi dence furnished by the developmental examinations, numerous inter views, and naturalisticobservations of the children at home and in a guidance nursery. Although the conclusions of our study are prelimi nary in character, we may hope that they will contribute to a better understanding of the child in terms of vision and a better understand ing of vision in terms of the child. The two should not be sundered. With increased knowledge it is possible that the visual behavior of the individual child will become an acute index for the appraisal of fundamental constitutional traits...

The book contains a detailed account of numerical solutions of differential equations of a number of elementary problems of physics using Euler and second order Runge-Kutta methods using Mathematica 6.0. The problems are motion under constant force (free fall), motion under Hooke's law force (simple harmonic motion), motion under combination of Hooke's law force and a velocity dependent damping force (damped harmonic motion) and radioactive decay law. Also included are uses of Mathematica in dealing with complex numbers, in solving system of linear equations, in carrying out differentiation and integration, and in dealing with matrices.

This book demonstrates Microsoft EXCEL(R)-based Fourier transform of selected physics examples, as well as describing spectral density of the auto-regression process in relation to Fourier transform. Rather than offering rigorous mathematics, the book provides readers with an opportunity to gain an understanding of Fourier transform through the examples. They will acquire and analyze their own data following the step-by-step procedure outlined, and a hands-on acoustic spectral analysis is suggested as the ideal long-term student project.

GLACIAL GEOLOGY and the Pleistocene Epoch by Richard Foster Flint Professor of Geology in Yule University New York JOHN WILEY SONS, Inc. London CHAPMAN HALL, Limited To the memory of MAX DEMOREST 1910-1942 Outstanding glaciologist, excellent field companion, generous and thoughtful friend, who died to save the lives of others. November 30, 1942 PREFACE The Pleistocene epoch occupies a peculiarly important place in the time scale of geology, for it embraces the events of the latest million or more years in the history of the Earth and is therefore so recent that it bridges the gap between the geologic changes now in progress and the more remote past. When the work of the geologist is finished, wrote Gilbert, 1 and his final comprehensive report written, the longest and most important chapter will be upon the latest and shortest of the geo logic periods. The chapter will be longest because the exceptional full ness of the record of the latest period will enable him to set forth most completely its complex history. The changes of each period its erosion, its sedimentation, and its metamorphism obliterate part of the records of its predecessor and of all earlier periods, so that the order of our knowledge must continue to be, as it now is, the inverse order of their antiquity. This fact in itself furnishes an adequate reason for making the prin cipal facts of the Pleistocene epoch compactly available, not only to geologists but also to Geologists, archeologists, geographers, and . others whose studies reach back into the prehistoric realm. In addition, the increased pace of research upon Pleistocene problems in general, and problems in glacial geology in particular, that has been evidentduring the last two decades has emphasized the necessity, in this field, of a summary that will be at once a reference to the data already established and a means of indicating the areas and problems in which further research is most needed. These are the principal objectives of the present volume. No one knows better than its author that it falls short of attain ing them. Knowledge of the Pleistocene has grown to such an extent that a complete reference work would become an encyclopedia. The consequent necessity for condensation has required the exercise of selective judgment at every turn. The list of references at the end of the book is far from complete, though an earnest effort has been made to see that it is representative. In particular it may lack important titles that have appeared in some countries during the war years and that have not yet been widely distributed. 1 Gilbert 1890, p. 1. viii PREFACE This discussion treats the Pleistocene frankly from the point of view of glaciation, the outstanding characteristic that distinguishes the Pleisto cene from the epochs that preceded it. The somewhat cumbersome title was selected with this fact in mind, in an effort not to create the impression that the work is a fully balanced treatment of every phase of the Pleistocene. As is pointed out in Chapter 16, the correlations of Pleistocene events cited and suggested are, as far as possible, those based on geologic evidence rather than on archeologic evidence. In the presentation of geologic evidence itself stream-terrace data are used as little as possible in the belief that this class of data is more frequently subject to faulty interpretation than the data obtained from features ofother kinds. In particular this book avoids, in correlation, deduction from any theory of Pleistocene climatic fluctuation which sets up a fixed chronology of events. This conservative attitude is adopted on the principle that only when the stratigraphic column is built up strictly on geologic evidence can the influence of prejudice in favor of a particular theory of climate be avoided...

Albert Einstein discovered that the motion of all objects in the universe is determined by the structure of space. In The Fundamental Force, author and computer scientist Len Kurzawa reveals the structure of space, and how this structure leads to an understanding of the universe.

With charts, tables, and illustrations, The Fundamental Force provides a step-by-step understanding of what is happening in the universe. With this understanding, unsolved mysteries can now be explained. It discusses:

How gravity works Why the motion of bodies in space follows a pattern Why galaxies rotate like solid objects How galaxies are made and where the matter comes from to make them How the structure of space determines the structure of objects in space The true nature of tides Why planets transition from elliptical to circular orbits Why there is a procession of their orbits How the forces of nature are derived from the one fundamental force

Presenting a unique and thoughtful view of the universe's origin and future, The Fundamental Force changes the way the universe is viewed.

VIRUS DISEASES OF PLANTS VIRUS DISEASES OF PLANTS BY JOHN GRAINGER PH. D., B. Sc. OXFORD UNIVERSITY PRESS LONDON HUMPHREY MILFORD 1934 PREFACE THE need for a small book upon the subject of Plant Virus Diseases appeared during my teaching work at Leeds University and in the County of Yorkshire. The study of this subject is, indeed, developing rapidly, but it seemed that this was not sufficient justification for with holding a simple text-book from the student of Mycology or Plant Pathology. A comprehensive volume would be inappropriate, as yet, and would have a limited use. The aim of this book has therefore been to introduce the student to the phenorrfcria associated with Virus Diseases, rather than to provide him with descriptions of all known viroses it is typical rather than complete. Many pitfalls aw r ait the new worker on Virus Diseases, so it was decided to include descriptions of the various items of technique in common use. The list of references at the end of the volume will provide an introduction to the very extensive literature on the subject of Plant Viruses. In its compilation, accessibility and comprehensiveness o the papers quoted have been constantly in mind. The references cited in the text follow the general plan of the book, being representative, not exhaustive. It is with great pleasure that I acknowledge my in debtedness to many persons to my wife, for much con structive criticism and help, and to Dr. J. Henderson Smith, of Rothamsted, who criticized the manuscript in its early stages. Dr. J. Johnson, of Wisconsin University, U. S. A., has helped in ways too numerous to mention, and Prof. J. H. Priestley, of Leeds University, introduced me to the study of VirusDiseases of Plants, and helped consider ably in its prosecution. Many workers in Ireland, Holland, America, Germany, and our own country have given written and verbal communication of their results. The Oxford University Press has throughout been most cour teous and helpful. J-G - June, 1933. J CONTENTS . INTRODUCTORY. Historical i II. THE RELATION OF A VIRUS TO ITS HOST PLANT 4 Symptoms of Mosaic Diseases. Symptoms of Yellows Diseases. Miscellaneous Symptoms. Symptom Complexes the Potato Virus Group. Host Range of Virus Diseases. Carriers. Increase and De crease of Virulence. Resistant Varieties. Immunity. Recovery. The Masking of Symptoms. The Effects of Shading. Seed Trans mission. Pollen Transmission. Soil Transmission. Virus Diseases and Vegetative Propagation. Histology and Cytology. Local Lesions. Necrosis. The Spread of Virus in its Host. The Concen tration of Virus in its Host. Physiological Effects. Developmental Anatomy. Organisms associated with Virus Diseases. . PROPERTIES OF THE VIRUS EXTRACT . . 24 Studies on the Effect of Heat. Concentration of the Virus Extract. Inactivation by Disinfectants, c. Attenuation by Oxygen. Ultra-Violet and Dark-Ground Photography. Ageing of the Virus Extract. Inactivation by High Pressure and Pulverisation. Filtra tion and Size of Virus Particles. The Participate Nature of the Virus. Purification of the Virus Extract. Chemical Nature of the Virus. Attempted Cultivation of the Virus in vitro. The Electrical Charge of Virus Particles. IV. THE RELATION OF INSECTS TO VIRUS DISEASES 35 General Characters of Insect Transmission. Technique of Insect Transmission. Insect Cages. Transference of Insects. The In cubation Period of the Virus on theInsect. The Duration of Virus bearing by the Insect. The Preparation of Microscope Slides of Insects Feeding on Plant Tissue. An Insect Test for the Filter passing Ability of Some Viruses. Some Virus Diseases and their Insect Vectors. V. ECONOMIC EFFECTS AND MEASURES OF CONTROL . . . . . .44 Damage caused by Virus Diseases. Potato Viruses. Rogueing. The Use of Resistant Varieties. The Use of Carrier Varieties. The Use of Immune Varieties. Vegetatively Propagated Stocks should be free from Disease. Indexing. The Use of Seed Propagation. The Sterilization of Soil...

Today, air-to-surface vessel (ASV) radars, or more generally maritime surveillance radars, are installed on maritime reconnaissance aircraft for long-range detection, tracking and classification of surface ships (ASuW-anti-surface warfare) and for hunting submarines (ASW-anti-submarine warfare). Such radars were first developed in the UK during WWII as part of the response to the threat to shipping from German U-Boats. This book describes the ASV radars developed in the UK after WWII (1946-2000) and used by the RAF for long-range maritime surveillance.

The book introduces concepts on a wide range of materials and has several advantages over existing texts, including: 1. The presentation of a series of scientific postulates and laws of RF and microwaves, which lay the foundation for the behavior of waves and their propagation on transmission lines, is unique to this book compared with similar RF and Microwave texts.2. The presentation of classical laws and principles of electricity and magnetism, all inter-related, conceptually and graphically.3. There is a shift of emphasis from rigorous mathematical solutions of Maxwell's equations, and instead has been aptly placed on simple yet fundamental concepts that underlie these equations. This shift of emphasis will promote a deeper understanding of the electronics, particularly at RF/Microwave frequencies.4. Wave propagation in free space and tramsmission lines has been amply treated from a totally new standpoint. Designing RF/Microwave passive circuits using the Smith Chart as covered in this book becomes a systematic and yet pleasant task, which can easily be duplicated by any practitioner in the field.5. New technical terms are precisely defined as they are first introduced, thereby keeping the subject matter in focus and preventing misunderstanding, and 6. Finally the abundant use of graphical illustrations and diagrams brings a great deal of clarity and conceptual understanding, enabling difficult concepts to be understood with ease.The fundamentals of RF and microwave electronics can be mastered visually, through many tested practical examples in the book and in the accompanying CD using Microsoft Excel environment. This book is perfect for RF/microwave newcomers or industry veterans The material is presented lucidly and effectively through worked practical examples using both clear-cut math and vivid illustrations, which help the reader gain practical knowledge in passive circuit design using the Smith Chart.

Nurture curiosity and even joy in the youngest scientists. The 24 inquiry-based lessons in this lively collection show you how. The activities are organized into sections on animals, plants, and nature walks. Rather than merely presenting science facts to 3- to 7-year-olds, you’ll prompt them to make discoveries of their own. They’ll explore critter camouflage, probe pumpkin insides, make bird feeders, and more. A Head Start on Life Science is as easy to use as it is inspiring. Each lesson includes lists of learning objectives and required materials, relevant background to help you prepare, plus at-home activities written in English and Spanish. Connections to multiple subjects—including reading, writing, math, dramatic play, and art—let you offer related learning opportunities. Extensions help you relate the science to children’s everyday lives and encourage them to explore with their families. You can use A Head Start on Life Science in preschools, elementary schools, informal science settings, home schools—anywhere you want to engage children in meaningful, longer-lasting science learning. The book is a follow-up to NSTA’s popular A Head Start on Science. Like that treasury of science activities, this collection is designed to heighten children’s sense of wonder about the natural world.

This book was written to start a new conversation about how Dr. Simeons' protocol has relevance, not only as a hormonal therapy, but as a means to end our national eating disorder. Instead of continuing to apply the protocol as a short-term diet, it shoulder be discussed as a real solution --a tool to end irrational eating for emotional fulfillment. This country is dealing with a crisis: an addiction to eating emotionally, and the obvious result is the overwhelming increase in obesity. Think about the number of people in our culture who eat without hunger. When you observe our nation's behavior with food, it's very clear that fat isn't what we should be obsessed about, and weight shouldn't be the target of the problem. We need a genuine desire to eat less, one that isn't dependent on weight loss as a reward. This requires each of us to be accountable for our own emotions, and find happiness in life not centrally stimulated by food. "Finally a book that credibly answers the questions every doctor, patient, and skeptic needs to know about the hCG protocol." - Dr. Heidi Anderson, Doctor of Osteopathic Medicine "I've been prescribing hCG for weight loss for over four years, and nothing I've read comes close to having this level of expertise. Without question, this is the most informative and enlightening book about Dr. Simeons' hCG protocol available." - Dr. Ed Hagen, OB/GYN "Robin's approach to the hCG protocol is ingenious. Using the protocol as a way to heal the mind and body as an emotional and physical therapy is exactly what this country needs." - Becky Crowther, Registered Dietitian, Life Coach

How does a writer discuss her creative process and her views on a writer's role in society? How do her comments on writing relate to her works? The Hindi writer Krishna Sobti (1925-2019) is known primarily as a novelist. However, she also extensively wrote about her views on the creative process, the figure of the writer, historical writing, and the position of writers within the public sphere. This study is the first to examine in detail the relationship between Sobti's views on poetics as exposed in her non-fictional texts and her own literary practice. The writer's self-representation is analysed through her use of metaphors to explain her creative process. Sobti's construction of the figure of the writer is then put in parallel with her idiosyncratic use of language as a representation of the heterogeneous voices of her characters and with her conception of literature as a space where time and memory can be "held." At the same time, by delving into Sobti's position in the debate around "women's writing" (especially through the creation of a male double, the failed writer Hashmat), and into her views on literature and politics, this book also reflects on the literary debates of the post-Independence Hindi literary sphere.

This book outlines the history of the vortex theory and its latest development, 3D spiral string theory.

Electron storage rings play a crucial role in many areas of modern scientific research. Introduction to Beam Dynamics in High-Energy Electron Storage Rings describes the physics of particle behaviour in these machines. Starting with an outline of the history, uses and structure of electron storage rings, the book develops the foundations of beam dynamics, covering particle motion in the components used to guide and focus the beams, the effects of synchrotron radiation, and the impact of interactions between the particles in the beams.