Contribution to the Physiology of Respiration under the Arctic Climate. 



99 



The calculated values for the percentage of carbonic acid give 

 the average 480 + 0018, p. = 0089 or V^^lo of average, and the 

 partial pressure in mm. Hg. an average of 342 + 012, fi = 059 

 or Г7 ^/o of the average. 



The averages of the direct determinations give: average == 524 

 -I- 0043, fjL == 0"19 or 3-6*^/0 of the average; the partial pressure in 

 mm. Hg. : average = 373 ^ 0-21, a = 0-95 or 29 "/0 of the average. 



Both series are thus very homogeneous. With the exercise in 

 breathing quietly and evenly, which the respiration experiments 

 afford, it was not difficult for me to carry out Haldane and Priestley's 

 experiments afterwards. 



I made some preliminary expiration experiments, not included 

 here as the analyses were not as a rule carried out, in order to 

 accustom myself to the arrangement, and then took some samples 

 in immediate connection with the respiration experiments. In these 

 cases the expiration was certainly rapid but yet quite under control 

 and only a little greater than an ordinary expiration. The table 

 shows that in the 5 successful, twin-determinations I have come to 

 the same result by the two methods, but, it is to be remarked, only 

 when I use the directly taken "inspiration-sample" for comparison. 

 This however is just what we should expect from what has been 

 said above. The table further shows, that the "expiration-samples" 

 are the least variable, probably because they are easiest to make- 

 On the last two days I tried to alter the mode of respiration, chiefly 



