April 25, 1890.J 



SCIENCE. 



265 



ing to note that these have been materially morlified recently, as 

 shown by column (7) Formerly they vvere exceedingly unsatis- 

 factory. It will be seen that the most satisfactory argument lies 

 in columns (3) and (6); but since column (6) is for a ventilated 

 psychrometer, and the readmgs used were unventilated, we must 

 conclude that the chemical method for obtaining vapor pressure, 

 as given by this investigation, does not agree with the condensing 



hygrometer. It is much to be regretted that comparisons were 

 not instituted between the chemical method, the sling psy- 

 chrometer, and the condensing hygrometer. This paper is a valu- 

 able addition to our knowledge of chemical methods, and nar- 

 rows down the remaining unexplored field of research for 

 measuring the moisture of the air. H A. Hazen. 



Washington, April 16. 



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