92 J- Lindhard. 



November 1907, 10 experiments 

 January 1908, 12 — 



May — 3 — 



In addition to the above, I have also made some experiments 

 at different times of the day, chiefly in connection with temperature 

 investigations made at the same time. These, in all 28, were Carried 

 out in November-December 1907 and in May 1908 and are noted in 

 a special table along with some experiments from a third series in 

 December 1906. 



Altogether 107 experiments are noted in the tables. These are 

 all self experiments; owing to the lack of space it was impossible 

 for me to make experiments on others. There is nothing which 

 would lead one to believe, however, that the characteristics appearing 

 in my respiration and which are discussed more particularly below, 

 are due to individual conditions; on the contrary, numerous analo- 

 gies from the results of earlier investigators distinctly indicate that 

 I have been quite a regular and normal subject. 



The following table embraces 10 complete and 3 incomplete ex- 

 periments. The agreement in the columns of the different, observed or 

 calculated elements is very great, as the respiration in the various ex- 

 periments has been perfectly regular and my condition, with exception 

 perhaps of one day (No. 132), uniform ; it is allowable, therefore, to 

 regard the results as a sufficiently trustworthy expression of my 

 respiration at the period mentioned. As I had become familiar with 

 the respiration-mask and with the arrangements on the whole, and 

 as the different parts of the apparatus with hardly any exception 

 were working properly, no preliminary experiments were necessary. 



On the second day of the experiments, a leak was discovered 

 at the connection between the sampling-receiver and the analysing 

 apparatus, and the first two analyses of the expired air had to be 

 omitted as unreliable. In experiment No. 136 the minute hand of- 

 the stop-watch stopped at 28; though I took note of the ordinary 

 works of the watch for the sake of control, I could not feel sure, 

 whether the time was 30 or 31 minutes and I have therefore omitted 

 from the comparison the elements of the experiment which are 

 functions of the time. Experiment No. 138 has been omitted, as the 

 watch stopped. The temperature in the laboratory was compara- 

 tively low on most days, but it is only for a few days that I have 

 noted any great feeling of cold (experiments Nos. 128, 131 and 133). 

 The low temperature during experiment No. 132 was less felt; my 

 condition on that day was abnormal owing to lack of sleep. Defæ- 



