THE TEMPERATURE OF THE MONKEY AND ITS DIURNAL VAEIATION. 93 



39' 



Noon 



38' 

 8 



37° 





V^ ^\ 



X \. A 



\ 4^C ******** ^ V 





^K H^^;£s^ v <^,\ 



- 1 ,7 "-o\ 



\,J J Y''/ 



>^^L/ 





12 1 2 

 Fig. 13.- 



3 4 5 6 



8 9 10 11 12 1 2 3 4 5 6 7 8 9 10 11 12 Hours 



-Mean diurnal curve compounded from all the monkeys for Periods I. 

 (continuous line), IV. (interrupted line), and V. (crossed line). 



The total range for the whole period is not much affected, but the times at which 

 the daily minima and maxima are reached are very variable. The total range for B 

 is 2-8° (36-6 at 5 a.m. on April 28th to 39'4 at 9 p.m. on May 1st), for C 2*2° (36-7 at 

 7 a.m. on 28th to 38*9 at 1 p.m. on 29th), for D 3-2° (36-1 at 7 a.m. on 29th to 39*3 

 at 1 a.m. on May 2nd), for E 2*0° (36'8 at 5 a.m. on 28th, and 1 a.m. on 29th, to 38*8 

 at 11 a.m. on 27th, and 11 a.m. on May 1st), in F 2'6° (36'3 at 5 a.m. on 28th to 38'9 

 at 7 a.m. on May 2nd), and for the mean of all 1'8° (36'9 at 5 a.m. to 387 at 11 a.m. 

 on 28th). 



PERIOD V. — Continuous Light. 

 This extended from 9 a.m. on May 2nd till 9 p.m. on May 8th. The room was 

 illuminated by daylight during the day, and by a powerful electric light during the 

 night, but otherwise the conditions were similar to those obtaining throughout the 

 preceding period, and the general effect on the temperature curves was similar. From 

 an examination of chart I. it might appear that all rhythm had been abolished (the gap 

 is due to the fact that one of the observers was unable to take his place on May 3rd), 

 but when the twenty-fourly means for the whole period are scrutinised it will be found 

 that this is not the case (see figs. 8 to 13 — crossed line — pp. 91-93). In fig. 13 the type 

 of curve of this period conforms as nearly to that of the normal (continuous line) as does 

 that of Period IV. (interrupted line). 









PERIOD 



V. — Continuous Light for 6 



Days. 





Mean 

 Temperature. 



Mean 

 Range. 



Minimum. 



Maximum. 



B 

 C 

 D 

 E 



F 

 Avera 



g e 





38-39 

 38-35 

 37-69 

 38-18 

 37-89 

 38-12 



0-96° 



0-87 



0-65 



0-85 



0-87 



0-70 



37 "97 at 5 a.m. 

 37-95,, 11 „ 

 37-37,, 9 p.m. 

 37-67,, 9 a.m. 

 37-65,, 9 ,, 

 37-82 ,, 9 ,, 



38-93 at 7 p.m. 

 38-82,, 11 ,, 

 38-02,, 3 and 5 p.m. 

 38-52 ,, 3 p.m. 

 38-52,, 7 ,, 

 38-52,, 11 „ 



