18 J. LiNOHARI). 



of temperature takes place rather soon, and then the temperature 

 remains invariable, eventually rising a little again. This is confirmed 

 by a few measurements. 



On waking after 5 hours On waking after 10 hours 



36-39° С 36-69° с. 



Experience goes to show that during the "dark period" the sleep 

 is worse than during the summer. In a single individual during 

 the winter period, when his sleep was particularly bad, I have made 

 17 measurements taken twice, of which 6 with negative, 9 with 

 positive values and 2 with no difference. 



At a period during the winter, which will be discussed more 

 closely below% we slept in the day-time and worked during the 

 night. In some the transition rendered the sleep troubled during 

 the first "nights"; there was consequently less difference when 

 sleeping in the day than in the night during the winter period. 

 Conversely, the difference was greatest when sleeping in the day 

 during the summer months, because as a rule the sleep was quite 

 short then. 



With regard to the mouth temperature, its relation to the 

 work of the muscles is quite inconstant. As a rule it does not rise during 

 work. On working indoors it is almost constant, on working in 

 the open air it always falls; but in a single case I have found it so 

 much raised, while staying indoors soon after working in the open 

 air, that the rise must without doubt be ascribed tp the work. On 

 the other hand, I have seen that even energetic exercise indoors 

 was not able to prevent the mouth temperature, raised by the meal. 



Nor are the lowest values, as for the rectal temperature, obtained 

 on waking — the morning temperature varies somewhat strongly 

 according to outer conditions — but on being in the cold air. Thus, 

 the mouth temperature does not follow the changes of the rectal 

 temperature during sleep. 



Time Mouth temp. Rectal temp. 



10-40 p. m. 3605° С 36-80° С. After being in the open air. 



12 night 35-50° - — 



7-15 a.m. 36-40° - 3650° - — sleep. 



