xu,.B, 1 Shaklee: Experimental Acclimatization 7 



fore it seems reasonable to suppose that the increase of 1.5° in 

 body temperature over that of the day before in the shade was 

 due to the sun's rays alone. Since the black-bulb thermometer 

 reading, when the monkey's temperature was raised by the sun's 

 rays, was 51.7°, and since the air temperature was lower at this 

 time, the humidity probably lower, and the wind higher, it would 

 appear that the sun's rays which were strong enough to produce 

 a black-bulb reading of 51.7° were more than strong enough at 

 this time to raise this monkey's body temperature through 1.5°C. 



The effect of conditions other than the sun's rays and air 

 temperature upon this monkey. — Table II further shows that 

 the body temperature of this monkey in the sun was higher 

 when the air temperature was only 30° (10.25 in the morning) 

 than when the air temperature was 32° (1.15 or 2.15 in the 

 afternoon). This emphasizes the well-known fact that the hot- 

 test weather is not necessarily the most injurious, unless we 

 understand by "hottest" something else than the highest tem- 

 perature registered by the ordinary thermometer, that is, the 

 atmospheric temperature. If we compare the weather condi- 

 tions at 10.00 o'clock in the morning, which were soon followed 

 by the highest body temperature observed on this day, with 

 ihose obtaining at 1.00 in the afternoon, which were closely 

 followed by a body temperature 1.4° lower, we find that this 

 lower body temperature, in spite of a higher air temperature, 

 was accompanied by a lower reading of the black-bulb thermo- 

 meter, a higher wind velocity, and a lower relative humidity. 

 Each of the last three conditions would work toward offsetting 

 the effect of increased air temperature, and this fact accounts, 

 at least partially, for the lower body temperature when the 

 surrounding air was 2° hotter. These observations show why 

 the portion of the day that was the hottest, judged by the 

 ordinary thermometer, was not the most injurious to the monkey; 

 it was because the energy of the sun's rays was less, the wind was 

 blowing harder, and the air was not so humid. Therefore there 

 are four factors that must always be taken into account in any 

 attempt to determine the cause of a rise in body temperature 

 or of death following exposure to the sun, namely, the energy 

 of the sun's rays and the temperature, the movement, and the 

 humidity of the air. 



The relation of heat to the death of monkeys in the sun. — Since 

 Aron makes the statement that monkeys die in "seventy to eighty 



