104 J- Lindhard. 



the forenoon. There was never any desire to defæcate during the 

 experiments, and there is therefore no reason to believe, that this 

 factor has had any influence on the frequency. 



Total volume of air respired. The total amount respired 

 per hour is on an average 470 + 363 litres, fx = 19-41 or 4-1 7« of 

 the average. The variation is not strikingly great; but the distribu- 

 tion of the deviations is of such a nature, that we may suspect 

 some factors other than pure chance to have influenced the results. 

 Experiment No. 30 is omitted; it falls here outside the limit calcu- 

 lated according to the method described above. The series becomes: 



+ 30 

 -30 



— 20 



— 16 |- > 3 = 23-0 "/o 



— 14 



— 2 2|- > 6 = 461 - 



4-13 



+ 20 3^ > 11 = 84-5 - 



+ 27 



^ 21 4 1^ > 13 = 1000 - 



— 1 



— 4 



— 22 



This corresponds to a curve with two maxima. It appears 

 already from direct observation that the maxima must lie at 450 — 

 455 and 480 — 490, as also that the negative variants fall on days 

 with low temperature (cf. the table). If we separate the two groups, 

 we obtain, for group I, the average 453 + 234, fi = 850; and for 

 group II, the average 485 + 312, ц = 1225. The distribution of 

 the deviations in the first group is of some interest: 



— 13 



— 3 



-f 1 

 + 2 



+ 15 



There is a well-marked fall and then a regular rise in the 5 

 succeeding "cold days"; and again a fall on the last, isolated cold 

 day. This is the same sequence as appeared for the respiration 

 frequency, and it will reappear, but in a reverse order, in the alve- 

 olar carbonic acid tension. 



