1Q3 J. Lindhard. 



apparatus becoming loose and thus not working properly. The 

 gas-sariiple obtained was too small for analysis. The stop-watch 

 again went wrong in this series (No. 51), but the experiment w^as 

 continued and the time taken from the ordinary works of the watch. 

 This means an uncertainty of some seconds, but, even if we take a 

 possible error of 15 seconds into account, which is certainly too 

 high an estimate, the uncertainty is still less than 1 ^Vo, so that there 

 is no occasion to exclude the experiment. In a second case (experi- 

 ment No. 54), I woke up sweating and uncomfortably warm. The 

 temperature reading also shows the highest number of the series, in 

 spite of a relatively low temperature in the room. Though I have 

 no doubt that special conditions prevailed during this experiment, 

 in which all the elements investigated are strikingly high, there is 

 no sufficient reason here either for excluding the experiment from 

 the calculations. It is noted for the first two experiments, that I 

 felt myself slightly uncomfortable, without being able to find any 

 other reason for this than — contrary to the usual — a purely 

 psychical irritation towards the mask. 



The pulse during this period was likewise very variable, but 

 on the whole distinctly less frequent than in the previous series. 

 The pulse was counted in a recumbent position before dressing (the 

 temperature was measured during dressing); where two frequencies 

 are noted for the pulse, these were counted respectively before and 

 after micturition. At this time I began to take note of the desire 

 to micturate and the micturition as the possible causes of the rela- 

 tively great fluctuations in the frequency of the pulse in the morn, 

 ings. Defæcation occurred as a rule once daily in the forenoon. 

 The bodily weight is on the decrease during the whole period; 

 considering my regular mode of life, I venture to conclude that the 

 decrease has proceeded evenly. 



The respiration frequency is considerably lower than during 

 the previous period of experimentation and it is also much less 

 variable, partlj^ perhaps because the fluctuations of both the baro- 

 meter and temperature are less. For the rest, the influence of the 

 air-pressure on the variations from day to day is not distinctly 

 recognizable. 



With regard to the frequency during the separate experiments, 

 its regularity was throughout irreproachable. I have only noted it 

 in one case; experiment 46 gave 116'5 — 118 respirations for every 

 15 minutes. 



The average for the frequency is 732 + 0067, ц = 036 

 or 49 ^'/o of the average. The distribution of the deviations is quite 

 regular. 



