1 For numerous illustrations of the various morbid conditions of the anus and rectum, see the author’s 64-page booklet, entitled How to Become Strong.

2 Chapters XXII, XXIII, and XXIV have been revised from Papers contributed to Albright’s Office Practitioner, in 1908.

3 I found it more convenient to use the words mucus channel, mucus fistula, etc., in preference to sinus, as they better convey my ideas to the average reader.