The author has taken the opportunity to make changes which, he believes, will increase the usefulness of the book.The principal change has come in the new form which will certainly be found more convenient.The sequence of the exercises in Chap. I. has been somewhat changed and a few new subjects have been introduced. The order in which the various bacteria is taken up has been altered so that they are now to be studied in groups. This arrangement is in keeping with recent tendencies, and it is hoped that it will impress the student with the similarity between closely related forms, and also emphasize certain minute but important differences.The addition of a number of new cuts will tend to greater clearness.The general plan of the book remains the same.Valuable suggestions have been received from several investigators and teachers. Especial mention is due Mr. John F. Nicholson, Assistant Bacteriologist to the Wisconsin Experiment Station, for valuable assistance.Suggestion or criticisms will be gladly received.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.

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