POISONOUS DRUGS 



185 



over 800,000,000 people habitually smoke or chew tobacco, 

 or take snuff. The effect of tobacco upon the user varies 

 with differences of age, temperament, and manner of living. 

 Thus an amount of indulgence which does not seem to have 

 any ill effect upon the health of a man of middle age and 



Fig. 174, I. — Coca {Erythroxylon Coca, Coca Family, Erythroxylaceae) . 

 Flowering branch. Leaf. (Baillon.) — Shrub about 2 m. tall; leaves 

 whitish green below; flowers yellow; fruit scarlet. Native home, Peru. 



Fig. 174, II.— Cotu. 



Flower-bud. Flower, entire. 

 (Baillon.) 



Same, cut vertically. 



phlegmatic temperament who leads an out-of-door life, is 

 found to be plainly harmful to a young man, particularly 

 one of nervous or excitable temperament, and especially if he 

 leads an in».loor life. Whether when taken in moderate 



