jjg J. Lindhard. 



With exception of No. 75 no irregularity of importance occurs 

 in any of the experiments included. In the case of No. 75 the stop- 

 watch only went for some time, and the time of ending the experi- 

 ment was taken from the ordinary works of the watch. The error 

 of some seconds thus introduced has however but very small im- 

 portance. In addition to this, however, there is some uncertainty 

 about the analysis of the expired gas, as on that day the temperature 

 of the bath rose unusually high and was only read after the gas- 

 sample had been led over for the first time. The temperature is 

 therefore possibly too high, which means that the percentage of 

 carbonic acid given is too low in this case. As the error thus in- 

 troduced cannot be taken to reach 1 "/o of the value for the carbonic 

 acid and as this is of quite subordinate importance for the alveolar 

 carbonic acid tension, the experiment has been included. 



The pulse is as usual variable; most of the values fall about 63. 



The bodily weight was determined on the 12/ XI and 1/XII, and 

 the weights given have been interpolated from these. 



The carbonic acid percentage in the inspired air is distinctly 

 higher than during any of the previous experiments; the difference 

 is however scarcely so great as to have any influence on the results. 



The frequency of respiration has again risen ; on an 

 average it is 838 + Oil, ц = 050 or 42 ^/o of the average. In 

 the 10 experiments, however, there are only two deviations in a 

 positive direction, experiments 78 and 79, and the average given is 

 thus an incorrect picture of the conditions. On the other hand, I 

 cannot find any reasonable ground for the greatly increased fre- 

 quency on these days. There w^as nothing unusual in the temperature 

 or height of the barometer. Defæcation occurred as usual once in 

 the day, in the evening. I had permitted myself one irregularity, 

 being up most of the night of the 22nd— 23rd to take part in astro- 

 nomical observations, but I had again slept normally on the night 

 of the 24th. Nor can I believe that the slightly heavy expiration at 

 the beginning of experiment 79 could work in the direction men; 

 tioned, it rather means that I was extremely sleepy during the ex- 

 periment and also somewhat hungry. If we exclude these 2 experi- 

 ments, of which for the rest only the last falls outside the calculated 

 limit, the average becomes 814 4^ 0044, fx = 018 or 15 ^'/o of the 

 average. Any dependence on the air-pressure and temperature can- 

 not be detected. 



Within the separate experiments the frequency has been unex- 

 ceptionably even; I may give the following results from a couple 

 of preliminary experiments. 



