Excerpt from Introduction to Animal ParasitologySpecial attention has been paid to presenting the life cycles of parasites in detail, relating these, where possible, to the properties of the environment. When a life cycle is presented in diagrammatic form, in this way, the result is frequently complex, but it has been found that the preparation of such diagrams helps to focus attention on some overlooked aspects of the life cycle.Prominence has also been given to two new and rapidly developing fields of parasitology, namely, immunity to animal parasites and the development oftec for the cultivation of parasites in vitro. Within the past few years remarkable advances have been made in both these fields, and these open up exciting possibilities for the future.Biological research is now being carried out on such a scale throughout the world that a text in most specialised fields is out of date almost as soon This is certainly true in parasitology and the constant ¿ow of reprints reaching the author each week serves to emphasise this fact. Many of the ideas set down here will require reconsideration in the light of further work, and this thought should be constantly before the student, as he turns over the pages of this book.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully, any imperfections that remain are intentionally left to preserve the state of such historical works.