The present edition may be regarded as a descendant, much changed and greatly enlarged, of the late Dr A. D. Imms' Outlines of Entomology, first published in 1942. This went through three further editions without much change, but after the death of the original author a fifth, revised edition by Professor o. W. Richards and myself appeared in 1959 and a sixth in 1978. The book now appears in a considerably extended version in which I have tried to provide a more balanced introduction to the whole field of modern entomology by dealing with several aspects of the subject not discussed at all in previous editions. Thus, in addition to innumerable lesser changes in the sections on insect structure, function, development, classification and phylogeny, I have completely recast the earlier chapter on some important modes of life in insects. This now includes a far wider range of biological topic;s well exemplified by the insects and should, I hope, appeal not only to, those already dedicated to entomology but also to others with more general biological interests. A completely new chapter on the biology of insect populations has also been added and may serve to indicate the debt which modern ecological theory owes to work on insect populations. It should hardly be necessary to apologize for introducing a certain amount of elementary mathematics into this account of a subject which is now among the most highly quantitative of biological disciplines.

The relative lack of information on determinants of disease, disability, and death at major stages of a woman's lifespan and the excess morbidity and premature mortality that this engenders has important adverse social and economic ramifications, not only for Sub-Saharan Africa, but also for other regions of the world as well. Women bear much of the weight of world production in both traditional and modern industries. In Sub-Saharan Africa, for example, women contribute approximately 60 to 80 percent of agricultural labor. Worldwide, it is estimated that women are the sole supporters in 18 to 30 percent of all families, and that their financial contribution in the remainder of families is substantial and often crucial. This book provides a solid documentary base that can be used to develop an agenda to guide research and health policy formulation on female health--both for Sub-Saharan Africa and for other regions of the developing world. This book could also help facilitate ongoing, collaboration between African researchers on women's health and their U.S. colleagues. Chapters cover such topics as demographics, nutritional status, obstetric morbidity and mortality, mental health problems, and sexually transmitted diseases, including HIV.