no 



ARON. 



Table IV. — Loss of weight of rabbits in sun and shade. 



Time. 



Total 

 num- 

 ber of 

 hours. 



In sun. 



In shade. 



Weight. 



Urine 

 and 



faeces 

 col- 

 lected. 



Re- 

 duced 

 loss of 

 weight. 



Weight. 



Urine 

 and 

 faeces 

 col- 

 lected. 



Re- 

 duced 

 loss of 

 weight. 



At 

 start. 



At 

 end. 



Loss. 



At 

 start. 



At 

 end. 



Loss. 



8 to 9.50 a. m 



2 to 4 p. m 



9.30 to 11.45 a.m. 



ft. m. 



1 50 



2 

 2 15 



Gms. 

 1,640 

 1,795 

 2,182 



Gms. 

 1,580 

 1,744 

 2,032 



Gms. 



60 



51 



150 



Gms. 

 18 

 10 



■ 35 



Gms. 



42 



41 



115 



Gms. 

 1,943 

 2,148 

 1,730 



Gms. 

 1,936 

 2,137 

 1,725 



Gms. 



7 



11 



5 



Gms. 



Gms. 



7 



11 



5 



Reduced per hour and kilo body weight. 



Loss in 

 sun. 



Simulta- 

 neous loss 

 in shade. 



Grams. 

 14 

 12 

 23 



G7-ams. 

 2 

 3 

 2 



Cats behave more or less as do dogs or rabbits. Their body temperature 

 rises, and if they are exposed to the tropical sun long enough, they will 

 die. 



EXPERIMENTS ON MONKEYS. 



Experiments on monkeys promised the best result because these 

 animals are at home in the Tropics. Monkeys, like rabbits and dogs, 

 have no sweat glands, and their physical heat regulation is confined to 

 the reduction brought about by water evaporated from the lungs and 

 mouth by increased respiration. However, this capability to evaporate 

 water is very limited. In my experiments the monkeys were fastened 

 in sunny places in the garden, or on the roof to a small stick by means 

 of a chain around their bodies. The body temperature of the animals 

 exposed to the sun rose within one hour- from 38°. 5 or 39° to 42° or 

 more. The subcutaneous temperature at the same time reached values 

 of 45° and even 46°. Within seventy to eighty minutes the monkeys 

 died, even if they were exposed to the sun in the early forenoon, between 

 9 and 10, in December and January. These months are among the coolest 

 in Manila. Even an open umbrella gives sufficient shade to protect the 

 animals from the injurious effects of the sun. I have especially studied 

 the changes of the subcutaneous and rectal temperatures in monkeys and 

 the relation between these two values deserves attention. The sub- 

 cutaneous temperature in a normal monkey inside the house and for the 

 greater part in the shade is somewhat below the rectal. As soon as 

 the animals are placed in the sun, the subcutaneous temperature rises 

 above the rectal, and, until the end of the experiment, exceeds the latter. 

 The interior of the body is warmest in normal animals and becomes 



