THE TEMPERATURE OF THE MONKEY AND ITS DIURNAL VARIATION. 



97 



he was suffering from symptoms of gastro-iiitestinal irritation (vomiting and diarrhoea) 

 produced by over-eating. In these circumstances he could not be considered normal, 

 and so is excluded from the average column in this period. From that column it 

 may be stated that in the after-period there is a slight rise the first day, a distinct 

 rise the second, and a slight rise the third, and that after three days of full feeding 

 the mean temperature has not returned to the normal. The mean temperature of 

 B, C, E, and F, for the fore-period is 38*29, and for the last day of the after-period 

 38 "12, i.e. '17 below the normal. 



The mean diurnal range was less in the starvation period than in either the fore- 

 or after-periods, with D again as an exception, and it was greatest in the after-period. 



39 : 

 S 

 6 



4 

 2 



3S : 

 8 

 6 

 4 

 2 



37° 



Noon 





Ate^Ss 



-^ **\ ^ 



4^.^-*o \ N v 



^j?'' \[ ii_ ^ 



^V ^^M- **' ^ 



\ / A 1 \ ' JK $Sl 



**»*.., ,*T^ ■'<*~'ji i) ***H-f ° ^ 







12 1 



3 4 5 6 7 8 9 10 11 12 1 



3 4 5 6 7 8 9 10 11 12 Hours 



Fig. 15, — Compounded curves from all the monkeys for fore-period (continuous 

 line), starvation period (interrupted line), and after-period (crossed line). 



This is seen in fig. 15, in which the mean curves for all the monkeys are represented for 

 the three periods. 



Fig. 16 shows curves compounded from the records of all the monkeys for the first 

 day of the fore-period (continuous line), the first day of the starvation period 

 (interrupted line), and the last day of the starvation period (crossed line). In its 

 general characters the curve for the first day of the starvation period agrees with the 

 normal curve, but the type of curve for the last day of that period is different; it 

 falls distinctly below the level of the others, and the maxima elevations are reached 

 earlier in the day. 



CONCLUSIONS. 



Mean temperature. — On account of the fact that there is in the monkey a very 

 distinct diurnal variation, the temperature will vary considerably according to the period 

 of the day at which the observations are made, and it has probably been stated too high 

 by most observers, since no one, so far as we know, has taken the temperature in the 

 TRANS. ROY. SOC. EDIN., VOL. XLV. PART I. (NO. 4). 13 





