Wherever it seemed necessary for clarity, the original text has been supplemented. When the text was at variance with ideas commonly accepted in this country, it became necessary to consult the literature and attempt to reconcile the differences. This was made somewhat difficult by the lack of a bibliography in the German edition, but ample bibliographical material on the histology of domestic animals is available in the reference works listed in the back of this book. Wherever it seemed advisable to give the authority for a statement, a footnote has been added. References to books repeatedly cited are given in abbreviated form in the footnotes, but complete bibliographical information will be found in the annotated list of references mentioned above. The appendix on microscopic technique has been omitted because the subject is usually taught in special advanced courses, for which several good books are available. The senior translator and editor assumes full responsibility for the text in its final form. Criticism will be gratefully received.
