The cordial reception given this text is much appreciated by both the author and the publishers. In issuing a fourth edition the chapters have again been carefully reviewed and the known facts to date in elementary histology have been properly recorded.
The new introduction is written Wholly for the elementary student, to arouse in him an interest in the subject matter of the text, and to show the close relation of normal histology to kindred important sciences. The text on spermatogenesis has been enlarged and the known facts stated in as clear and brief a manner as possible. Some Of the figures have been replaced with new ones, and minor changes have been introduced throughout the text wherever the subject matter could be improved.