This book uses art photography as a point of departure for learning about physics, while also using physics as a point of departure for asking fundamental questions about the nature of photography as an art. Although not a how-to manual, the topics center around hands-on applications, sometimes illustrated by photographic processes that are inexpensive and easily accessible to students (including a versatile new process developed by the author, and first described in print in this series). A central theme is the connection between the physical interaction of light and matter on the one hand, and the artistry of the photographic processes and their results on the other. This is the third volume in this three-part series that uses art photography as a point of departure for learning about physics, while also using physics as a point of departure for asking fundamental questions about the nature of photography as an art. It focuses on the physics and chemistry of photographic light-sensitive materials, as well as the human retina. It also considers the fundamental nature of digital photography and its relationship to the analog photography that preceded it.

Trees and tree products have long been central to human life and culture, taking on intensified significance during the long eighteenth century. As basic raw material they were vital economic resources, objects of international diplomatic and commercial exchange, and key features in local economies. In an age of ongoing deforestation, both individuals and public entities grappled with the complex issues of how and why trees mattered. In this interdisciplinary volume, contributors build on recent research in environmental history, literary and material culture, and postcolonial studies to develop new readings of the ways trees were valued in the eighteenth century. They trace changes in early modern theories of resource management and ecology across European and North American landscapes, and show how different and sometimes contradictory practices were caught up in shifting conceptions of nature, social identity, physical health and moral wellbeing. In its innovative and thought-provoking exploration of man's relationship with trees, Invaluable trees: cultures of nature, 1660 -1830 argues for new ways of understanding the long eighteenth century and its values, and helps re-frame the environmental challenges of our own time.

This book offers the first in-depth investigation into the relationship between the National Birth Control Association, later the Family Planning Association, and contraceptive science and technology in the pre-Pill era. It explores the Association's role in designing and supporting scientific research, employment of scientists, engagement with manufacturers and pharmaceutical companies, and use of its facilities, patients, staff, medical, scientific, and political networks to standardise and guarantee contraceptive technology it prescribed and produced. By taking a micro-history approach to the archives of the Association, this book highlights the importance of this organisation to the history of science, technology, and medicine in twentieth-century Britain. It examines the Association's participation within Western family planning networks, working particularly closely with its American counterparts to develop chemical and biological means of testing contraception for efficacy, quality, and safety.

Transcendental Magic is a classic of occultism, prized for its wide-ranging wisdom, thorough guidance and revelatory contents. Written by Eliphas Levi in the mid-19th century, Transcendental Magic offers seekers of occult knowledge a bounty of guidance and knowledge. Informed by research spanning many centuries of arcane arts, the author offers us profound guidance to the ceremonial rituals one must perform in order to make contact with spirits and other non-corporeal entities of the universe. In Levi's explanations we encounter various figures of occult lore. Monad is synonymous with God; the creator of everything contained in our physical plane. Derived from the Pythagorean school, through Levi we learn how Monad interacts with the creation. This discussion is related to the Kabbalah, which attempts to define the relationship between what is infinite and what is finite.