An interesting case, which I deem typical of many in these Christian Science days, declares that he early learned that all living animals, especially man, have “a constructive, preserving, and renewing principle or energy within them fully competent to care for the body in every particular, demonstrated by the evidence of a vast number of recorded cures of so-called incurable diseases without any external remedial agency.” This element can become amenable to conscious control. “We are composed of a thousand billion cells, far greater in number than that of the entire population of the globe since man arrived and each of them infinitely complex and charged with potencies.” With such a force man should place no limitations upon himself, for he has inexhaustible recuperative energy, etc. If such a faith has little justification for science, it may, nevertheless, give a mental attitude that is conducive to a poise and confidence that in itself has marked hygienic and therapeutic value. It is interesting to note that cultivated men and women seem far less prone than the ignorant to the medical fetichism that ascribes exceptional value to some nostrum or single item of diet or regimen and this suggests how fast the age-long quest for a universal panacea is vanishing from modern consciousness. As men grow old and have a long experience and youthful friends have passed away, it is inevitable that they should seek the cause of their longevity and this urge would naturally increase with years. Therefore, while the individual answers to this question have little scientific value, they are of both psychological and practical interest. Underneath them all there is a tendency to identify hygiene with morals and most men who achieve great age thus tend to look with complacency upon their life as a whole as a triumph of virtue, even though in fact it may have been quite irregular. _How do you keep well, that is, what do you find especially good or bad in diet, regimen, interests, and personal hygiene generally?_