The general plan of this book remains unchanged; the author has, however, incorporated important additions to the subject as recorded in the recent literature, as well as many new illustrations. Experience has shown that teachers of histology prefer to use their own laboratory outlines. The author has therefore eliminated the chapters on directions for laboratory work and on histologic technic, which is taken up in detail in many special books on technical methods. References to the literature are recorded as footnotes and reassembled in a bibliography at the end of the book, thus making it convenient for the student who desires to pursue further the study of particular subjects. The numerous illustrations are well adapted to the text and some of them are in color.