30 



J. LlNDHAIÎD. 



if the sleeping-bag contributes to the further equalization of the 

 temperature, the latter varies nevertheless appreciably summer and 

 winter. As the temperature on waking, as shown above, is fairly 

 constant, we have a practical means of comparing temperatures 

 taken at this time on journeys under varying external temperatures. 



From a journey in April 1907 at an air temperature between 

 12° and 31° below zero, I have 10 measurements taken immediately 

 after sleep with an average of 3626^, fj. = 016; from a journey in 

 May-June in the same year 15 measurements with an average of 

 3652°, n = 0-24, when the air temperature was about 0°. All the 

 measurements were made on the same individual, who employed 

 the same sleeping-bag, while wearing very much the same clothing 

 and living on the same food. On the journey homeward the person 

 concerned was stoker and slept in the comparatively greatly heated 

 rooms near the machine; for 8 measurements directly after sleep I 

 found an average of 370°, [i = 0125. There is hardly any doubt 

 that the variations are due to the outer temperature. 



The decrease in the temperature heightened by the work of the 

 muscles is more conspicuous when staying in the open air than 

 indoors. 



Time Rectal temp. 



1125 a.m. 3845° С (st) After work outside. 



Ч /ЧГ OP mo ,„iN f — staving indoors (but soon after 



105p.m. 36У1 - (St) ' A с I- \ A 



t^ \ defæcation outside. 



110 p.m. 3702° - (r) - — ^ 



1215 p.m. 38-45° - — work outside. 



1-55 p.m. 37-33° - — stay indoors. 



10-30a.ni. 38-15° - - hill-climbing (tp. — 122°). 



12-30 p.m. 36-20° - — measuring work (tp. — 105°). 



9-30 a.m. 37-80° - — hill-climbing (tp.— 62°). 



12-30 p.m. 3700° - — measuring work and lunch (tp. — 5-2°). 



4-15 p.m. 36-05° - — — — (tp. — 6-0°). 



Although the fall of temperature is usually the more conspicuous 

 the higher the temperature has been, such low values as in the 

 examples last given are not found when staying indoors, and this 

 in spite of the measuring work claiming always some, even if slight 

 exercise, and although one must often "clap hands" and the like 

 to be able to work with the telescope screws. 



It will be instructive to consider the temperature of the mouth 



