8 



Dr. A. Rattray on the Effects of [Nov. 21, 



But this and the 1*843 oz. less carbon are perhaps partly excreted by the 

 vicariously active skhi and liver ; but how far has yet to be determined. 

 But it must be remembered that less carbon has usually to be eliminated 

 in the tropics, both from the reduced and often altered ingesta, and 

 lessened brain and body-tissue waste. 



II. The Effect of Tropical Climate on the Bodily Development. 



The following experiments prove that tropical climate, per se, inter- 

 feres with the normal growth of the body. During the voyage forty-eight 

 cadets, of the impressionable age of 14J to 17, were weighed and 

 measured in height six times at intervals of sixty days, i. e. after four 

 successive changes of climate, their diet being abundant, fresh, and 

 healthy. If lads stop growing, and still more if they lose flesh, it proves 

 that some unhealthy influence is at work. 



Table VII. shows : — First, that tropical heat interferes much with the 

 bodily growth and development, as indicated by the weight, retarding 

 it in most, and stopping it in some ; second, that temperate climates 

 have an opposite influence ; third, that a second exposure to heat 

 increases its wasting effect, and also lessens the subsequent building- 

 up results of cold. 



Exp. 





Grain 

 in weight. 



1 



j Stationary 

 in weight. 



Loss 

 in weight. 





Per cent. 



Average 

 gain, 

 lbs. 



Per cent. 



lbs. 



Per cent. 



Average 

 loss, 

 lbs. 



2. 



3- 

 4- 



5- 



Effect of heat : 60 days in the \ 



tropics, temp. 7o°-82°F.... j 

 Effect of cold: 60 days in the S. \ 



Temp.Zone,temp.55°-7o°F. J 

 Effect of heat : 60 days in the T 



tropics, temp. 7o°-82° F. J 

 Effect of cold : 60 days in the "1 



N.Temp.Zone,temp.52°-7o° J 

 Effect of cold: 60 days in the 1 



JN\Temp.Zone,temp.32°-5o° J 



56*26 



9375 

 2-17 

 86-96 

 93-48 



3 - 8i 

 6 '35 



2*0 



4- 



5- 91 



I4-58 



6-25 



2 - 17 



6-52 

 6-52 





1 2916 



95-66 

 6-52 



3- 07 



4- 61 



2'0 



The effect of climate on growth in height is somewhat different. As 

 a rule this should be regular, though oftener, so to speak, per saltum, 

 than with weight. 



