ACTION OF THE TROPICAL SUN. 



Ill 



cooler toward the periphery. In the sun, on the contrary, the body is 

 hottest on the outside aJid cooler toward the inside, the latter now 

 receiving heat from the periphery. As a result of this condition the 

 temperature measured in ano in a normal animal is very nearly the same 

 as that of the blood and surrounding tissues, but in monkeys exposed 

 to the sun, it will lie, in all probability, below that point. The parts 

 of the body nearest the periphery will show a temperature almost the 

 same as the subcutaneous, the more central portions a temperature 

 between the rectal and subcutaneous. Experiments may be mentioned 

 in this connection in which two monkeys were exposed to the sun, the 

 one with its normal coat of hair, the other, shaved all over. The tem- 

 perature of the shaved animal rose much more rapidly than that of the 

 other. On the other hand, in the shade or inside a house, the shaved 

 animal has a slightly lower body, and a decidedly lower subcutaneous 

 temperature. The explanation is clear when we consider the fact that 

 the coat of hair protects both against loss of heat by conduction and 

 an increase from radiation. 



The following characteristic examples of protocols illustrate these 

 points and they are even more plainly brought out by the temperature 



charts. 



Table V. — Experiments with normal and shaved monkeys. 



Date. 



Remarks. 



Time. 



Temperature of— 



Black- 

 bulb 

 ther- 

 mom- 

 eter. 



Monkey II 

 exposed 

 to sun. 



Monkey X 

 in shade of 

 umbrella. 



Monkey XI 

 in normal 

 hair coat ex- 

 posed to sun. 



Monkey XII, 

 shaved, ex- 

 posed to sun. 



Sub- 

 cuta- 

 neous 



Rec- 

 tal. 



Sub- 

 cuta- 

 neous 



Rec- 

 tal. 



Sub- 

 cuta- 

 neous 



Rec- 

 tal. 



Sub- 

 cuta- 

 neous 



Rec- 

 tal. 



1910. 

 Nov. 16 



1911. 

 Jan. 18 



In animal 

 house. 

 Exposed to 

 sun 9 a.m. 



Slight crai 



In animal 

 h u s e. 

 Exposed to 

 sun 2. 25 

 p.m 



8.50 a.m. 



9.15 a.m. 



9.30 a.m. 



9.45 a.m. 



10.00 a.m. 



'10.08 a.m. 



Qps, forced ( 



2.05 p.m. 



2.35 p.m. 



2.40 p.m. 



2.55 p.m. 



2.60 p.m. 



3.05 p.m. 

 / 3.10 p.m. 



3.20 p.m. 



3.35 p.m. 



3.45 p.m. 



3.50p.m. 



4.00 p.m. 



\ 4.15 p.m. 



°C. 

 38.1 

 39.8 

 41.0 

 42.0 

 43.9 

 43.9 

 md sic 



°C. 

 38.0 

 42.0 

 44.0 

 44.0 

 44.8 



°C. 



°C. 



°C. 



°C. 



°c! 



°C. 



52° 







































































)w res 



piratio 

 37.5 

 39.2 



n, sali 

 38.5 

 39.4 



ya dro 

 38.1 

 40.4 



PPing, 

 38.4 

 39.9 



10.10 a 

 36.6 

 40.9 



. m.die 

 37.9 







d. 



40.6 

 43.8 

 44.0 

 44.4 

 Died. 

















44.6 

 44.8 

 45.5 











43.2 



41.4 









39.6 



39.8 



43.8 



41.4 

 41.6 















40.3 





44.4 













42.3 













40.2 



40.5 















44.5 

 45.4 



43.4 

 f 44.1 

 idled. 













40.0 



40.1 



1 











i 







