This text contains the scientific contributions to the Fourth International Symposium on Sphingolipids, Sphingo lipidoses and Allied Disorders held at the Kingsbrook Jewish Medical Center on October 25-27, 1971. These meetings were conducted under the auspices of the Isaac Albert Research Institute of the Kingsbrook Jewish Medical Center and the National Tay-Sachs and Allied Diseases Association, Inc. Four symposia, held in 1958, 1961, 1965 and 1971 were designed to gather the most relevant and innovative of the laboratory and field studies concerned with these hereditary disorders. The texts generated by these periodic meetings have mirrored the increasing absorption of the scientific community in the problems of sphingolipid metabolism. The first meeting in 1958 consisted of but twelve pre sentations, the majority emanating from local laboratories. The current sessions contain 48 scientific presentations by scientists from nine countries and demonstrate the increas ingly diversified techniques and approaches employed in the study of these diseases. Many of the authors, in exploring data on the mucopolysaccharidoses and leucodystrophies, as well as the sphingolipidoses, have given recognition to those biochemical areas held in common by these otherwise diverse disease processes. The problems of prevention and therapy of these diseases have been considered by some of the contributors. Laboratory screening procedures designed to detect carriers of the va rious lipidoses are now available and the experiences of some laboratories in this area are summarized within this volume. The prospective identification of heterozygotes may indeed become a powerful adjunct in genetic counseling."

The present volume contains the scientific contributions to the Fifth International Symposium on "Current Trends in Sphingo lipidoses and Allied Disorders" under the auspices of the Isaac Albert Research Institute of the Kingsbrook Jewish Medical Center, the Department of Pathology, Downstate Medical Center, State Uni versity of New York, Brooklyn, New York, and the National Tay-Sachs and Allied Diseases Association, Inc., New York. A review of the four previous Symposia shows the increase in scope of the scientific exploration in this rapidly expanding field. The first meeting, held in 1958, was devoted to the discussion al most entirely of Tay-Sachs disease. The majority of the work emanated from local laboratories. The participants at the present Symposium came from many other domestic and foreign research in stitutions. The scope of the papers presented at these meetings and the interest shown in the Symposium demonstrates the signifi cance attached by the scientific community to the problems of these hereditary diseases. The reasons for this are apparent, when one considers the contributions during recent years to our basic know ledge by lipid and enzyme chemistry, genetics, and neuropathology. Partly because of the hereditary nature of these diseases any new discovery in this field has general meaning and permits cautious generalization well beyond its clinical significance."

The history of so-called storage diseases goes back to the end of the 19th and to the beginning of the 20th century when Fabry, Tay, Sachs, Gaucher, Niemann, Hunter, and Hurler first described the disorders which up to now are called by their eponym. The clinical descriptions soon were followed by pathologic studies, and within a short time, the hereditary characters of these rare afflictions came to be recognized. Although sporadic reports during the early part of this century dealt with biochemical analysis of the "stored" materials in these disorders, it was actually in the late 1930s that the abnormal deposits started to attract the increasing attention of chemists. S. H. Thannhauser brought the broad concept of lipidoses as a group of related disorders to the attention of the medical profession for the first time, and in 1939 Klenk observed that the brain of a patient with Tay-Sachs disease contained greatly increased amounts of a glycolipid for which he proposed the name "ganglioside. " 20 years has thrown new light on these afflic Work carried out in the past tions and has pinpointed the enzymatic and lipid abnormalities associated with the various "storage" diseases. Moreover, electron microscopic studies have permitted detailed investigations of the fine structure of the various organs of afflicted patients."

I consider it an honor to have been asked to write the Foreword for The Diabetic Pancreas. Although I have been involved in the study of the pancreas since 1921, my interest goes back even further to the time, in 1918, that my father's sister, a nurse who had trained at the Massachusetts General Hospit.al, devel oped diabetes, lost weight, and died in diabetic coma. This sad event made a deep impression on me and was certainly pardy responsible for my choosing to join the Department of Physiology of the University of Toronto to begin a career in research into diabetes. This is not the place to describe in detail the wide-ranging research and study of the diabetic pancreas in which I have engaged in the past 56 years. Suffice it to say that I am familiar enough with the subject area to be able to predict a great future for this book. The editors have undertaken a very ambitious and worthwhile project, and their efforts have been supported and strengthened by contributors who are respected authorities in their fields, thus ensuring a successful presentation of this major work."