4 The Philippine Journal of Science i»i» 



Galbraith* for two other species of monkeys; (8) that there is 

 apparently a wide variation in this monkey's normal temper- 

 ature. This variation in body temperature seems to indicate, 

 as has been observed in other monkeys, that the temperature- 

 regulating mechanism of the monkey is not as efficient as is 

 that of man. This suggests the possibility that, if the monkey 

 can become adapted to life in the "tropical sun," man could 

 more readily become adapted. The responsiveness of the 

 monkey's temperature to external influences also suggests that 

 the change in body temperature of an unacclimatized monkey 

 might be a good index of the action of the sun upon the monkey 

 and, possibly, an index of the sun's harmfulness for other 

 animals, including man. 



The monkey is not injured by being seven hours in the sun. — 

 The first experimental exposure of this monkey to the sun 

 was made on November 29, 1911. It was exposed to the sun 

 at 8.35 in the forenoon on a horizontal pole resting 1 meter 

 above a "skin" tennis court. It was free to walk back and 

 forth. It received food at the usual hour, and water was given 

 after taking the temperature. 



The amount of sunshine recorded on this day at the Weather 

 Bureau building, 0.3 kilometer distant, was nine hours and six 

 minutes. If we take the Weather Bureau records, which would 

 be approximately accurate for the tennis court, as a basis for 

 our estimate, this monkey was exposed to the sun for five hours 

 and twelve minutes before any clouds appeared, that is, from 

 8.35 in the forenoon to 1.47 in the afternoon. The clouds lasted 

 eight minutes ; the monkey was again subjected to the action of 

 the sun, this time for one hour and twenty-four minutes. At 

 3.20 in the afternoon it had a respite from the sun of seven 

 minutes and was afterward in the sun for forty-eight minutes, 

 until 4.15 in the afternoon. This makes it probable that on this 

 day the monkey was exposed to the Manila sun for about seven 

 and one-half hours, including the hottest portion of the day. 



The monkey showed no sjonptoms of distress from the action 

 of the sun, although exposed for seven hours. It did, however, 

 show some depi^ession, as it lay on the pole for short periods 

 in the more severe portions of the day. No sign of injury was 

 noticed on this day or on any succeeding day. 



The effect of the sun on the monkey's temperature. — Although 

 the monkey showed no distress from this long exposure to the 



* Trans. Roy. Soc. Edin. (1906), 45, I, 65-104. The maximum normal 

 temperature of Rhesus macacus observed by Eyre and Kennedy was 40°., 

 Journ. Physiol. (1907), 35, xxx-xxxi. 



