194 



Ozone and the Atmosphere. 



various mountain tops and in many valleys of the Adirondacks, 

 New York State. The temperature, barometer, wind, etc., 

 were noted at the same time, although these meteorological 

 data are not of much importance, except as part of a connected 

 and simultaneous series of observations, conducted with a view 

 of establishing a chemical climatology of the United States. 

 At present, what is done in this direction can be looked upon 

 merely as the beginning of a study, which will hereafter yield 

 results of value to the agriculturist, the medical practitioner and 

 the physicist. Suitable equipment of our observatories, so that 

 they may yield not merely the meteorological, but also the re- 

 quisite chemical data, is essential to advance in climatology. 

 The following table contains some of the most interesting of 

 the determinations heretofore made : 



Table of the percentage of oxygen contained in the atmo- 

 sphere at various localities in the United States , 1876. 



Stevens Institute of Technology 

 i< ii a 



it ii i. 



ii i. ti 



Horticultural Hall, Centennial . 

 Machinery Hall. " 



Main Building, ' 



Agricultural Hall, " 



U. S. Building, 

 Centennial Grounds. " 



Stevens Institute of Technology 



Keene Flats, Adirondacks 



Mt. Marcy, Summit of 





DATE. 



PEE CENT. 



July 



4th, 12. M. 



20.957 



Aug 



2d, 1.20 P. M. 



20.957 





11th, 1. P. M. 



20.821 



" 



" (duplicate) 



20.843 



" 



29th, 



20.954 



" 



30th, 9.30 A. M. 



20.934 



'< 



31st, 5.20 P. M. 



20.942 



Sept. 



1st, 10,30 A. M. 



20.952 



" 



" (duplicate) 



20.957 



" 



7th, 10. A. M. 



20.932 



" 



" (duplicate) 



20.944 • 



Aug 



. 15th. 3.40 P. M. 



20.964 





21st, 5.15 P. M. 



20.937 



" 



18th, 4. P. M, 



20.868 



'< 



22d, 3. P. M. 



20.857 



" 



16th, 4. P. M. 



20.878 



" 



15th. 6- P. M. 



20.962 



" 



18th, " 



20.918 



Sept. 



26th, 10. A. M. 



20.915 



July 



17th, 



21.029 





21 st, 3. P. M. 



20.928 



" 



(duplicate). 



20.926 



Atmospheric Ozone. 

 In order to obtain some knowledge of the character of the 

 results arrived at in testing for atmospheric ozone according to 



