History of Air-Analysis 



53 



time of taking the sample and "that the theory that deficiencies in the 

 amount of oxygen in the atmosphere are caused by the descent of air from 

 an elevation fairly well agrees with the facts." In another paper 1 Mor- 

 ley discusses in detail the improbability of the von Jolly hypothesis. 



The experimental researches of Morley and von Jolly stimulated, 

 among other writers, Vogler, 2 who, in a theoretical presentation of the 

 subject, maintains that neither von Jolly's hypothesis nor that of Mor- 

 ley explains the anomalies as well as does the conception of a separation 

 of the gases of the air under conditions of high pressure. During a period 

 of minimum barometer he maintains that the rapidly moving currents of 

 air thoroughly mix the atmosphere, so that there is no difference in the 

 oxygen content, but when there is a period of high barometer the air is 

 quiet and there is a separation of the gases, with a high oxygen content 

 near the earth. 



Table 37. Determinations of oxygen made in air analyzed by Kreusler. 



By far the most complete collection of the literature on the composi- 

 tion of atmospheric air thus far published is to be found in the admirable 

 article by Kreusler. 3 Using a eudiometer similar to that employed by 



1 Morley, American Journal of Science, 1881 (3), 22, p. 429. 



2 Vogler, Chemisches Centralblatt, 1882 (3), 13, p. 556. 



3 Kreusler, Landwirtschaftliches Jahrblicner, 1885, 14, pp. 305-378. This article, 

 although published in a somewhat inaccessible place, has been most helpful in preparing 

 the material for this memoir. I have freely drawn upon the material Professor Kreusler 

 has collected and wish to express here my appreciation of his paper. 



