Temperature of the Human Body in Health. 



189 



taken hourly without any break, from 9.30 a.m. of January 12 to 8.15 

 of January 15. 



The amount of daily variation of January 15 is estimated from the 

 lowest temperature of the previous evening ; but on all the other days 

 the daily variation is estimated from the highest temperature of the day 

 to the lowest of the following night. 



From this Table we gain information on several points. 



Maximum Temperature of the Day. 

 The average maximum temperature of lads of about 12 years of age is, 

 according to our observations, 99° Fahr. Thus the highest temperature 

 reached was on 



1 day 98-6 



1 „ 98-8 



3 days 99-2 



3 „ 99-4 



Average 99*1 



Diurnal Variation of the Temperature. 



On 1 day this was 1*6 Fahr. 



3 days 2-2 „ 



3 „ 2-4 „ 



Iday 2-8 „ 



It thus appears that the diurnal variation in the temperature of boys 

 about 12 years of age is 2 0, 2 Fahr. 



Time when the highest Temperature of the Day is reached. 

 This occurred at some period between the hours of 9 a.m. and 6 p.m. 

 Thus on 



1 day the highest temperature was at 2 p.m. 



1 „ from 8 a.m. to 10 a.m. 



1 » at 10 „ 



1 » „10 „ 



1 » „ 4 P.M. 



The Hour of the Day when the Evening Fall begins. 

 It will be subsequently more fully shown that during the early morn- 

 ing hours the temperature quickly rises, and then during the greater 

 part of the day remains at about its highest point. In the evening it 

 again quickly falls, until the lowest temperature of the day is reached. 

 The time of day when the temperature of these lads begun to fall varied 

 very greatly; thus on 



1 day the evening fall began at ........ 2 p.m. 



2 davs , 4 .. 



