94 



J. Lindhard. 



cation took place once in the day during the period of the experi- 

 ments, in the evening, as a rule between 8 and 9. 



The pulse was noted immediately before and after the experi- 

 ment. The temperature of the body was not read. 



It will be useful to note briefly the principal points in each 

 column of the experimental series and later discuss the results all 

 together; I shall thus deal with the respiration frequency, the total 

 amount respired, the alveolar carbonic acid tension and the metabo- 

 lism in the order mentioned. 



The frequency of the respiration varies somewhat from 

 day to day. The average is 8-5 + 0072, ц = 037 or 436 »/o of the 

 average. No influence of the outer temperature can be noticed. In 

 the first part of the period, when my mode of life was quite regular, 

 the frequency showed a tendency in the opposite direction to the 

 air-pressure; in the later experiments, when my mode of life as well 

 as the weather was less uniform, the tendency is less distinct but 

 still on the whole recognizable. 



In the separate experiments the frequency is very uniform. I 

 have repeatedly counted it without the mask and convinced myself 

 that it was the same as during the experiments. 



In the last case the number 87 is too low; I had the distinct 

 feeling that a few of the respirations were longer at this time; on 

 this day the respiration was on the whole not so regular as on the 



