Other people's interests--tenement conditions, factory rules--can be described in figures and actions that appeal to the imagination and impress upon the mind pictures that are repeatedly reawakened by experience and observation on the playground, at home, on the way to school or to work. "Once upon a time--" will always arrest attention more quickly than "The human frame consists--." What others think of me helps me to obey law--statutory, moral, or hygienic--more than what I know of law itself. How social instincts dominate may be illustrated by an experience in advertising a public bath near a thoroughfare traveled daily by thousands of working girls. I prepared a card to be distributed among these girls that began: "A cool, refreshing bath, etc." This card was criticised by one who knows the ways of girls and women, as follows: "Of course you get no success when you have a man stand on the street corner and pass out cards telling girls to get clean. Every girl that is worth while is affronted by the insinuation." Acting upon this expert advice, we then got out a neatly printed card reading as follows: "For a clear complexion, sprightly step, and bounding vitality, visit the Center Market Baths, open from 6 A.M. to 9 P.M. daily." The board of managers shook their sage masculine heads and reluctantly gave permission to issue these appeals. Woman's judgment was vindicated, however, and the advantage was proved of urging health for "society's" sake rather than for health's sake, when the patronage of the bath jumped at once to considerable proportions. 6. _Other people's habits of health influence our well-being quite as much, if not more, than our own._ Because we are social beings, ability to get along with our families, our friends, our employers, is--at least so it seems to most of us--quite as important as individual health. For too many of us, living hygienically is absolutely impossible without inconveniencing and bothering the majority of persons with whom we live. I remember a girl in college,--a fresh-air fiend,--who every morning, no matter how cold, threw the windows wide open. Then, with forty others, I thought this girl a nuisance as well as a menace to health, but now, twenty years afterwards, I find myself wanting to do the same thing. Professor Patten, the economist, whom I shall quote many times because he is particularly interested in the purpose of this book, was recently dining at my house and illustrated from his own health the importance of teaching hygiene so as to affect social as well as personal standards. "To be true to my own health needs, I ought to have declined nearly everything that has been offered me for dinner, but in the long run, if I am going to visit, my eating what is placed before me is better for society than making those who entertain me feel uncomfortable."