BODY TEMPERATURE OF MICE 355 



36.59°C. Twenty-four readings of five females, on six different 

 days, gave a mean of 37.44°C. 



In order to determine the effect of varying the depth of inser- 

 tion of the thermometer, the rubber collar (ordinarily 17 nam. 

 from the tip of the bulb) was moved so as to lie 10 mm. from the 

 tip. Four readings of four males gave a mean figure of 35.28°, 

 while four readings of four females gave 35.58°. These tempera- 

 tures thus averaged 1.58° lower than the deeper ones. 



The mice, after an interval of two days in a basement room of 

 intermediate temperature, were moved to the cold-storage room. 

 Here the temperature ranged from 11.5° to 14.5°, the mean 

 being close to 13°. The relative humidity was about 70 per cent 

 on the only occasion when it was tested. The mice were kept in 

 this room for a period of six days. 



Fourteen readings of four males, on five different days, gave a 

 mean temperature of 36.54°. Twenty-one readings of five females 

 during the same period, gave a mean of 36.82°. 



When the rubber ring was shifted to a point 10 mm. from the 

 tip, three readings of three males gave a mean of 33.71°, while 

 five readings of five females gave 35.18°. These temperatures 

 thus averaged 2.24° lower than the deeper ones. 



Shortly after the return of the animals to the attic room, a 

 period of very warm weather ensued. On September 15, at an 

 air temperature of 31°, two readings of two males gave a mean of 

 36.83°, while four readings of four females gave a mean of 37.50°. 



On September 16, in an air temperature of 35° (humidity, 

 32 per cent), two readings of two males gave a mean of 38.18°, 

 while five readings of five females gave a mean of 38.50°. 



These newer experiments thus furnish ample confirmation of 

 some of the most important results presented in the body of this 

 paper. The temperatures of the females are 0.48° to 0.85° 

 higher than those of the males. A reduction 8.5°C. in air tem- 

 perature, accompanied by increased humidity, resulted in a 

 reduction in body temperature which was insignificant for the 

 males, but which amounted to about 0.4° for the females. The 

 extremely high temperatures to which the mice were subjected 



