AMERICAN JOURNAL OF SCIENCE. 
[THIRD SERIES.] 
Art. LIV.—On a possible cause of the Variations observed in 
the amount of Oxygen in the Arr ; Epwarp W. MORLEY, 
M.D., Ph.D., Hurlbut Professor of Chemistry, Western 
Reserve College, Hudson, Ohio. 
; In order to determine, if possible, whether the observed va- 
riations in the proportion of oxygen contained in the atmos- 
phere at different times is occasioned by the descent of air from 
Am, Jour. a Series, Vou. XXII, No. 132.—Drcempnr, 1881. 
