THE TEMPERATURE OF THE MONKEY AND ITS DIURNAL VARIATION. 95 



EFFECT OF INANITION.— PERIOD VI. 



After an interval of about three weeks, in which the monkeys were permitted to 

 resume their normal routine — rest during the night and activity during the day — we 

 began another experiment,* with a view to determine the effect of the ingestion of food 

 on the mean temperature and its diurnal variation. Period VI. extended from 6 p.m. 

 on May 29th till 6 p.m. on June 1st, and during this time (72 hours) the monkeys 

 were supplied with water, but were deprived of all other food. Throughout the fore- 

 period — from 1 p.m. May 26th till 6 p.m. May 29th— and the after-period — from 

 6 p.m. June 1st till 5 p.m. June 4th — two-hourly records were made in the ordinary 

 way under conditions as in Period I. (normal) with regard to feeding, rest, exercise, etc., 

 for comparison with the readings taken while the animals were deprived of food. The 

 results are presented briefly in tabular form below. 



The mean temperature for the starvation period was in every case lower than for 

 the fore-period, which may be taken as the normal. The fall was greatest during 

 the second day, with one exception (D), taking the mean of the fore-period as the 

 normal. In the subjoined table the sign + indicates a rise, and the sign — a fall. 

 In two cases, D and E, there is a slight rise during the last day, and in B and 





B. 



+ ■17 



c. 



D. 

 -•34 



E. 



F. 



Average. 



1st day 



+ "29 



- -02 



- -08 



+ •02 



2nd .. 



-•74 



-•88 



-■05 



-•69 



-•20 



-•56 



3rd „ 



- 59 



-•21 



+ •16 



+ ■38 



-•14 



-•05 



during the first day. Taking all the monkeys together (average column), it may 

 be stated generally that there was a very slight rise the first day, a marked fall 

 the second day, and a slight fall the third day. The rise during the first day is 

 difficult to explain, unless it be due to the fact that the animals were searching about 

 for food and were more active than usual. 



The mean temperature of the after-period was in two cases (B and C) lower than 

 that of the starvation period, and in the remaining three cases (D, E, F) higher, and 

 in two cases (D and F), it was higher than that of the fore-period. During the 

 after-period, the greatest rise takes place also during the second day. The only 





B. 



C. 



D. 



+ •74 

 -•21 

 -•85 



E. 



F. 



+ •06 

 + •43 



+ •27 



Average. 



1st day 

 2nd ., 

 3rd ,, 



+ ■13 

 + •27 

 + •32 



- -09 

 + •37 

 -•22 



-•09 

 + ■21 

 + •02 



+ •01 

 + •32 

 + 09 



marked exception to this is D, in which there is a distinct rise in the first day 

 and then a fall on each succeeding day, but this is probably due to the fact that 



* This was carried out by one of us alone (S. S.). 



