752 



PHYSIOLOGICAL STVOIFS OF THE RVFFFJ) GROiSE 



The results, summarized in figures 83 and 84, clearly show the existence ol a diurnal 

 variation in rectal temperature. iriHicalinji a similar trend in body temperature. Highest 



"F. 



108 5, 



"F. 

 ■ 106.5 



1080 



107.5 

 UJ 



a- 



D 

 (- 

 < 



a: 1070 



Ld 

 Q. 



UJ 



I- 



_l 1065 



< 



I- 



o 



LJ 



o: 1060 



I05.5L 



105.0 



— Group A 



— Group B 



_!_ 



1060 



107.5 



1070 



10 6.5 



106.0 



105.5 



U 105.0 



8 30 11:30 

 - -A.M. »K- 



230 



5 30 8 30 

 P. M . 



ll;30 



4^ 



230 



5:30 

 - A.M.- 



6 30 



TIME OF DAY 



I III KK 83. DIURNAL TRENDS IN RECTAL TEMPERATURE OF TWO CROUPS OF ADULT GROUSE, CROUP 

 A OF WHUH \V\S EXPOSED TO W \nr)nin\\l, IIOIR OF II.I.IMIN VTION \T MCHT 



temperatures were reached between 2:30 and 5:30 i).iii.. and lowest lictwcen 11:30 |).tn. and 

 2:30 a.m. The average difTerotup helween the hiirhesi and lowest leiiiperaliires dining the 

 21-hour period, was: 



For males: 2.69°F.± 0.257" (standard error ) 



For females: 2.29°F. ± 0.139° (standard error 1 



With reference to the efT<'cl of light on the diurnal curve, the peak in l)<>d\ tem|)erature 

 reached at 5:30 ]).m. for (".roup A seems to have been due chiefly to extra activity and feed- 

 ing; allowed them during the iiddilional hoiii of light. 



Effect of F.xcitement and Activity on Ut)u\ Temperati hk 



Experiment 3 was designed lo measuie the eifi 1 I nf ernolinMal <\eili'nieiil aiMl Mm>eiil;n ac- 

 tivitv on rectal lernpi'rature and rale of breathing. Four fcriude and l«o male birds, in a 

 state of active digestion, were used. They were renioxed frmn llie lage one al a lime fio 

 body temperature and respiration nx-ordings. Kach wa> llien put into aiiolher (age ami 



