162 J- Lindhard. 



The last three results are thus greater than those given above, 

 especially as regards the total volume of air respired; the reason 

 for the last has been mentioned above. On the other hand, the 

 difference in the results for the respiration-frequency is remarkable, 

 as it goes in the opposite direction to the others. This is obviously 

 connected with the fact, that the frequency is a function of the in- 

 nervation of the vessels and is thus somewhat influenced by the 

 winter. 



In consequence of the foregoing it is extremely probable, that 

 the annual period is due in the main to the variations in the inten- 

 sity of the light. We should therefore be entitled to expect a cor- 

 responding though less distinct period in lower degrees of latitude. 

 So far as the available, sparse material goes, this seems also to be 

 the case. 



The experiments in the following table were all made in the 

 morning while fasting ^ Each experiment occupied 30 minutes and 

 the arrangement was essentially the same as in my experiments. 

 The individual experimented on was well-trained to the work, as a 

 large series of experiments preceded those reported on here^; there 

 is reason to believe, therefore, that the results are a reliable expres- 

 sion of the respiration of the person concerned within the period 

 mentioned. 



Calculating the values for the separate columns,- we obtain 



P Vol. of 1 expir. CO., in alveoli 



t^requency ^^ ^^o saturated 'mm. Hg 



26/.s-«/4 15-2 4= 0-19,^ = 0-78; 759 ± 84, /г = 42-9; 384 ± 046, /u = 237 

 (12 exper.) 



i3/r,-iV.; 14-3 ± 007,// = 0-54; 801 + 42,^= 309; 353 4: 024, // = 175 

 (25 exper.) 



In spite of the relatively short space of time which lies between 

 the tлvo series, the results are distinct, which maj^ be considered to 

 rest partly on the fact, that the greatest changes in the intensity of 

 the light occur just at this time of year, partly also on the fact, that 

 the individual experimented on reacts very strongly to outer influen- 

 ces, a phenomenon confirmed by other experiments on the same 

 individual. The single values also fluctuate much more than in my 



' From material not 3'et published from the Laboratoiy of the Finsen Institute, 



kindly placed at my disposal by Dr. Hasselbalch. 

 - These experiments are not included here, as they were made after the morning 



meal. 



