History of Air-Analysis 



37 



different places in Switzerland; the results are reported in tables 14, 15, 

 and 16, respectively. 



Table 15. Regnault's analyses of air collected at Madrid. 



The percentage of oxygen in these different samples of air collected in 

 various parts of Europe ranged from 20.903 to 21, that is to say, it had 

 approximately the same limit of variation as the air collected in Paris. 



Regnault fortunately secured the cooperation of a number of travelers, 

 and hence was able to extend his observations considerably. The results 

 are given in tables 17 to 20. 



