AMAJAL HEAT. oil 



sixteen per minute. The digestive powers are at a very low ebb, 

 while as to its nervous sensibilities the animal is very markedly 

 depressed. 



The awakening from hibernation is a most interesting phenom- 

 enon in so far as the rise of the animal's temperature is very sud- 

 den. So sudden is the rise and in so short a time is it accomplished 

 that it surpasses the most rapid rise in temperature of any fever. 

 With proportionate celerity are the vital functions spurred on to 

 activity. 



Modifying Influences. Close observation shows that there occur 

 slight variations in man's daily temperature. It is f <und to rise 

 during the late morning and afternoon; to fall during the evening 

 and early morning. Because of differences in age of subjects, modes 

 of living, climate, etc., observers are not agreed as to the maximum 

 and minimum temperatures. However, it may be safe to say that 

 the maximum temperature is attained about from 3 to 5 o'clock in 

 the afternoon, while the minimum is registered at from 3 to 5 o'clock 

 in the morning. The range of difference averages about 1 C. 



CAUSES. Probably the two most important causes for these nor- 

 mal variations are muscular activity and food-ing estion. It is during 

 the day that man, as a rule, is most active and it is then that he 

 usually replenishes the waste of his body by the consumption of a 

 proper amount of food. Naturally he will be most inactive during 

 the night; his bodily functions will be depressed at that time so that 

 just so much heat will be generated as the economy needs. 



It has been found that the maximum and minimum points of 

 temperature in man can be inverted. Thus, if a man change his 

 mode of life so that he continue to work for a considerable length of 

 time at night and sleep in the daytime, after a week's time there will 

 be noted a gradual change toward inversion. It is well to note also 

 that the high and low points of temperature of the body correspond 

 to those times when the external temperature is high and low, respec- 

 tively. Badiation may thus be a not inconsiderable factor. 



Age. Just before birth the infant's temperature is generally 

 somewhat higher than that of its mother's uterus. After birth and 

 during the first few weeks the temperature remains fairly constant, 

 but still a little high. There is a fall of one-tenth or two-tenths 

 from infancy to puberty; a like amount from the latter period to 

 dddle life, when there occurs a slight rise. 



During muscular work the temperature rises rapidly, but, by 

 Jason of compensatory measures, the loss by radiation and conduc- 



