Comparative Air-Analyses 



107 



A second study of ocean air was made possible through the kindness of 

 Mr. Thorne M. Carpenter, of the Nutrition Laboratory, who carefully 

 collected a large number of samples on a return voyage from Genoa to 

 Boston in June 1911. Profiting by a discussion of the problem with Dr. 

 Krogh in Copenhagen, Mr. Carpenter took special precautions to collect 

 several samples of air dried over phosphorus pentoxide. Usually the 

 samples were taken by aspiration with the mouth, but in collecting the 

 dry samples it was found that the phosphorus pentoxide powder was me- 

 chanically carried to the mouth, with consequent discomfort; a rubber 

 bulb was accordingly used. The samples were collected between June 

 10 and 25, 1911, but it was inexpedient to analyze them before October 

 14 to 26, 1911. The results of these analyses are given in table 65. 



Table 65. Analyses of ocean air collected between Genoa and Boston. 



