J 12 J- Lindhard. 



ment. The number falls a little outside the calculated limiting 

 value, which is 7-70. The low number in experiment 66, taken in 

 conjunction with the other elements of the experiment, must be 

 considered as due to the influence of the low temperature in the 

 room. No relation with the air-pressure can be detected. The 

 average of the series is 7*09 + 0066, /^ = ОЗ! or 44 ''/o of the 

 average; if experiment 60 is omitted, the average is 701 4; 0048, 

 ^ = 0-22 or 31 ^^/o of the average. 



The total volume respired reaches its maximum in this 

 series. The average is 521 + 42, /^ = 195 or 3-7 ''/o of the average. 

 The limiting values are 521 + 382; two numbers fall outside these 

 limits, namely, experiment 60, where the high frequency was ac- 

 companied by an unusually large volume respired; it must be 

 remembered, however, that the higher the frequency is, the greater 

 will be the share of the "dead space" in the total volume respired, 

 so that the change in the effective total volume respired is much 

 less marked. The opposite is the case with experiment 66, where 

 the frequency is strikingly low. Excluding these two experiments, 

 we obtain for the remaining 8 an average of 521 4: 30, ц = 125 

 or 24 ^/o of the average. As the frequency is low, the volume of 

 the single expiration is very large. This deep, slow respiration was 

 not of a forced character; it was connected as a rule with distinctly 

 good health. My immediate impression was, that at the end of the 

 expiration or rather before the inspiration there .was a distinct 

 apnoic pause; but I was unable to undertake any further investig- 

 ation of this condition. 



The alveolar carbonic acid tension was small. For the 

 percentage of carbonic acid the average was 381 + 0046, ^ == 0*19 

 or 49 "/o of the average; estimated in terms of mercury pressure the 

 average is 27-1 ±_ 0-33, ц = 137 or 5-1 *^/o of the average. The last 

 value is obviously high, apparently influenced by the air tempera- 

 ture; it falls just on the calculated limit of the series. Excluding 

 this, the average becomes 377 + 0*038, ц == 015 or 39 ^/o of the. 

 average. In mercury pressure the average is 267 :4z 027, ц = 1'05 

 or 3"9*^/o of the average. 



The amount of carbonic acid given off is very little 

 greater than in previous series. The average is 241 -Jr 058, ^ = 

 2-4 or 10 "/o of the average. The most striking thing about the 

 series is, that experiment No. 66 does not, as might be expected, 

 give a value under the average. 



As a contrast both to the foregoing and to the later series, I 

 have a series of experiments for November in which the numbers 



