"... For the next week-end ... I ordained for myself a fast on lines ; that is, no food of any kind and only water to drink. Realising the probability and also the inadvisability of hoarding my fæces for the prescribed three days, I took a grain of grey powder on the Friday night and a dose of on the following morning. Then I fasted, secundem artem, until Tuesday morning. On Saturday I felt well but I am told that my conversation was terse in matter and staccato in manner. On Sunday I felt very well, and endured my trial in the spirit of a Christian martyr. I was resigned. On Monday I felt very well indeed, and did my work at home and at the hospital with zest and vigour. ... Since that time, now many years ago, I have frequently repeated the experience, and always with the same result. The first day, craving ; the second, resignation ; the third, rejoicing and rejuvenescence. The result is that I can cordially recommend the exercise to anyone who is obliged to lead a sedentary life."