Investigations into the conditions governing tlie temperature of tlie bodj-. 29 



of one degree. It may be assumed therefore that the variations in 

 the mouth temperature on changes in position are a direct conse- 

 quence of the latter. 



The change of temperature on the forehead cannot be mistaken; 

 it rises when tlie r position is occupied, to fall on changing to an 

 active position. 



As for the variations of temperature due to stasis or changes of 

 position they play on the whole a secondary part, while on the con- 

 trary the temperature of the air is a factor of paramount im- 

 portance, especially in regard to the temperature of the mouth and 

 skin; its effects are undoubtedly apparent also in the rectal temper- 

 ature,' but here much less conspicuous. 



More warmlv clad than usual 



-.^V. 



Fig. 3. 



As we are practically always in active movement when in the 

 open air in severe, cold weather, a comparison of day-curves for 

 summer and winter will not show the influence of the temperature 

 of the air. The curve will come to be a little higher for the winter, 

 if anything; when out, one is in movement, the rooms are as far 

 as possible heated and one is more warmly clad. But the very 

 fact, that the demands mentioned must be met in order to keep 

 well, proves that the outer temperature influences the heat of the 

 body on the whole. 



The two curves above are derived from measurements on the 

 same individual on 2 successive days. In the morning of the second 

 day he put on much thicker and warmer clothing than he was 

 accustomed to wear. His rectal temperature proved higher both on 

 this and the following days than on the foregoing, his mode of life 

 being otherwise quite the same. 



On the ship we could defend ourselves against the low temper- 

 ature of the air, but this was not the case on journeys; even if the 

 temperature was a little higher in the tent than without and even 



