410 BACTERIOLOGY. 



sweat glands, and consequently large and sud- 

 den losses of water from violent exercise have 

 a different effect upon him, and the kidneys 

 are thus often seriously injured through igno- 

 rance. Many bacteriologists taboo raw fruit 

 and salad, and this precaution may be wise, 

 particularly if, as Lahmann recommends, 

 qualitative consideration be given to the salts 

 in the food, specially to those occurring in 

 green vegetables. I have found that in train- 

 ing very remarkable and uniform changes 

 occur in the relative proportion of the most 

 important salts in the urine as compared with 

 the proportion appearing in a condition of rest 

 or of light work ; the amounts of urea, uric 

 acid, and phosphoric acid are affected in very 

 different ways, a condition that indicates a pro- 

 found alteration of metabolism and must surely 

 exert an influence upon heart and kidneys if 

 proper precautions are not taken. These ex- 

 treme degrees of metabolic disturbance are 

 connected with the ordinary conditions of life 

 through all possible intermediate stages. The 

 place of habitation as well as the nourishment 

 must be carefully looked after. These things 

 may all be learned in a properly directed edu- 

 cation just as easily as table manners, so that 

 they become as it were instinctive. There is 

 no greater folly than to change suddenly an 



