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Rh ; their measurements should be larger on that account. That the smokers are not appreciably heavier, taller and stronger than the nonsmokers may be due to the depressing influence of nicotine on the circulation and the consequent interference with normal growth.

3. The scholarship standing of smokers is distinctly lower than that of non-smokers. The intimate connection existing between the smoking habit and participation in the social and athletic activities of college life makes it impossible to determine how much, if any direct influence the smoking habit exerts upon scholarship, but the results of this study and the similar results obtained at Clark College indicate very clearly that the smoking habit is closely associated with idleness and lack of ambition for scholarly achievement.

Conclusions.—The writer has no desire to defend the use of tobacco. The motive in making this study was to ascertain the facts concerning the effects of tobacco upon college men. The teaching of hygiene is making rapid progress; quantities of new books are being published in which the large volume of new scientific facts on nutrition, muscular exercise, and the effects of alcohol take the place of the dogmatic statements and easy moral of the old books; a similar change is desired in the treatment of the problem of the effects of tobacco.

A study of the literature on the effects of smoking, years of medical examinations of boys and men, experience in teaching hygiene and the results of this study have led the writer to the following conclusions:

1. All scientists are agreed that the use of tobacco by adolescents is injurious; parents, teachers and physicians should strive earnestly to warn youths against its use.

2. There is no scientific evidence that the moderate use of tobacco by healthy mature men produces any beneficial or injurious physical effects that can be measured.

3. There is an abundance of evidence that tobacco produces injurious effects on (a) certain individuals suffering from various nervous affections; (b) persons with an idiosyncrasy against tobacco; (c) all persons who use it excessively.

4. It has been shown conclusively in this study and also by Mr. Clarke that the use of tobacco by college students is closely associated with idleness, lack of ambition, lack of application, and low scholarship.