J22 •'• Lindhard. 



tion of the last three days, the Aveather was uncertain, stormy, with 

 snow and relatively high air-temperature. The phenomena of the 

 "dark period" became very apparent; the general feeling was one 

 of instability, irritability and depression; the sleep at nights was 

 uneasy; I was often sleepy and indisposed during the experiments. 

 The gas-analyses especially were difficult, as the air-pressure con- 

 stantly varied and the temperature of the water-bath fluctuated very 

 greatly. In three analyses (experiments No. 98, 103, 105) there is 

 some uncertainty in the results, but as errors of this kind, as 

 previously mentioned, cannot be considered to have any influence 

 worth mentioning on the results, they are included. The analysis 

 of the inspired air on 29/1 can only be regarded as approximate. 



I have twice noted, that I have felt vortices in the breathing- 

 tube during the experiment, owing to the storm; they did not trouble 

 me, and I do not think that they can have influenced the results of 

 the experiments. On 23/1 (experiment 101) I was extremely sleepy 

 and found it difficult to count; I consider the number given as cor- 

 rect, in spite of the fact, that the count in the morning in the berth 

 gave a somewhat higher frequency. 



The bodily weight decreased a little in the first half of the 

 period, but remained constant during the latter half; weighed on 2/II. 



The pulse was counted in the berth shortly after waking up; 

 the series is very low, but exact information regarding the pulse is 

 lacking. 



The respiration- frequency in this series shows a slight 

 peculiarity, as it several times proved to be either a little higher or 

 a little lower than the average during the first minutes; this was a 

 result of my whole "nervous" condition. In experiment No. 96 the 

 frequency was about 10 in the first three minutes; introducing this 

 correction, the frequency in the remaining 27 minutes would be 

 952. As no greater irregularities than this occur, so far as known 

 to me, I have not thought it necessary to make any correction in 

 the л'alues given. 



The frequency in this series shows a distinct tendency to vary 

 in an opposite direction to the air-pressure. The highest value falls 

 on the 24/1, the day after the lowesl barometric condition read; it 

 should be noted here, however, that the barometer on the 23/1 was 

 steadily falling and only rose a little on the following night. The 

 strikingly low frequency on the 23/1, when regard is taken to the 

 amount of the single respirations, which for the rest form a very 

 regular series, might give rise to the suspicion that I had counted 

 wrongly, for example, that I had forgotten to move the balls back 

 and had thus counted 20 too few. Even though I was admittedly 



