120 •^- Lindhard. 



61 ^/o of the average. The distribution of the deviations is very 

 irregular; there are no specially great deviations, nor do any fall 

 outside the calculated limit; but the values for the carbonic acid 

 tension are so distributed that there are no variants between 28*9 

 and 304; on both sides of this interval there are 5 cases. What 

 such a separation can arise from, is obscure; neither the temperature 

 nor the air-pressure seem to exercise any apparent influence. 



Lastly, the irregularity is again found in the results for the 

 amount of carbonic acid expired. The average here is 

 237 4: 20, (ji = 9-5 or 40 ^/o of the average; but the distribution of 

 the deviations is more regular. The calculated, upper limit for the 

 series is 2557, thus the same as the value for the experiment No. 

 78. Compared with the other results for this experiment, it would 

 seem that the respiration was forced on this day; I have noted 

 nothing regarding the experiment, however, which could support 

 this view. Nor can any disturbing influence be detected on the 

 amount of carbonic acid expired from the side of the meteorological 

 factors, temperature and air-pressure. Here as for the other elements 

 the irregularities must be referred back to the fact, that the organism - 

 has been moved from its ordinary, regular physiological equlibrium 

 by the considerable attacks made upon it as described above. 



A more frequent determination of the bodily weight would cer- 

 tainly have been useful ; but even if we assume that the weight- 

 curve would have been less regular than that given, such could not 

 be imagined as having any marked levelling effect on the greatly 

 fluctuating values for the amount of expired carbonic acid. 



As I was obliged to give up a projected series of experiments 

 in October, owing to the sledge-journey, I was also compelled to 

 alter the last part of the programme. I decided therefore, to take 

 the projected experiments for December and February as one series 

 in the end of January. This gave me no experiments during the 

 winter solstice, but I obtained a series both at the beginning of the 

 dark period and towards its end, and the divStance from the "sum- 

 mer experiments" was very nearly the same at both sides. We 

 should expect, that any peculiarities due to the dark period w^ould 

 appear distinctly in January, even though the maximum could only 

 be expected to occur a month later. The sun reappeared, as men- 

 tioned, in the middle of February; but indoors, it still continued to 

 be the "dark period" for some weeks afterwards. 



The January series includes 12 experiments; one experiment (104) 

 had to be given up, as it proved impossible to keep the breathing-tube 

 open owing to a snow-storm. During the whole period, with excep- 



