612 



DR SUTHERLAND SIMPSON ON 



Table 111. 



Records of Rectal Temperature from two Brooding Hens, C and C, taken at noon before, 

 during, and after incubation. The Mean Temperature for three days before 

 incubation, for each week during incubation, and for three days after hatching 

 is also shoiun. 



1909. 



C. 



C. 



Room. 



1909. 



C. 



c. 



Room. 





°C. 



°C. 



°C. 





°C. 



°c. 



°C. 



May 23 



421 



41-8 





June 8 



40-7 



40-6 



18 



„ 24 



41-8 



41-7 





„ 9 



40-6 



41-0 



17 



„ 25 



421 



419 





,, 10 



41-2 



41-3 



21 











„ 13 

 ,, 14 



41-2 

 41-0 



41-6 

 41-3 



21 



23 











„ 26 



41-6 



41-1 



23 



„ 15 



41-3 



41-7 



24 



.. 27 



41-0 



411 



24 



„ 16 



41-2 



41-0 



19 



>, 28 



41-4 



41-7 



16 



„ 17 



41-0 



40-5 



10 



„ 30 



41-4 



41 -0 



21 



„ 18 



40-6 



40-6 



23 



„ 31 



41-6 



41-1 



24 



„ 19 



Hatching 





June 1 



41-7 



41-4 



24 



„ 20 



)> 





,, 2 

 „ 3 



41-5 

 41-4 



41T 



40-7 



26 



27 

















.. 5 



41-2 



41-0 



21 



,, 21 



42-2 



41-3 



27° 



,, 6 



40-5 



40-4 



18 



» 22 



42-2 



42-2 



31 



>. 7 



41-0 



40-7 



21 



„ 23 



41-4 



41-2 



22 



Before brooding 









42-0 



41-8 





First week 









41-45 



41-23 





Second week . 









41-17 



40-84 





Third week 









41-01 



41-12 





After hatching 









41-93 



41-57 





Comparison of Results with those of former Observers and Conclusions 



to be drawn from them. 



On consulting Professor Rice, of the New York State Agricultural College, as to the 

 existence of any data on the subject before beginning the second set of experiments, he 

 informed me that some observations had been made in his department in 1903 by 

 Messrs H. F. Prince and H. Jennings, and gave me access to the figures. They found 

 no marked difference in the temperature of the hen from the time she began to incubate 

 to the time she hatched. ... " The point to notice is that the broody temperature 

 was not abnormally low or abnormally high. It was rather under what we would expect to 

 find in broody hens if they actually had a so-called broody fever " (1). They also found 

 incidentally that the rectal temperature of hens which had just deposited an egg was 

 about two degrees (Fahrenheit) above the normal, due to the exertion and excitement 

 attendant upon the operation. 



In 1907 A. C. Eycleshymer (2) studied experimentally many factors in the natural 



