42 S Re murks on Mixed Gases, 



established/) III Ventured to assent to Mr! 

 Gough's calculation at page 312, as mentioned 

 in my letter, page 410; namely, that Schmidt 

 must have made his experiments with the 

 pressure of Is' or 16 inches of mercury. 



That Gentleman, in due course, answered 

 rrty note by. a polite letter, accompanying a 

 copy of his essays in the German language.*" 

 On looking it over I was surprised to find not 

 a single trace of the table given by Kirwan as 

 his, exhibiting the expansion of moist air ; 

 what increased my surprise was to find another 

 table on the expansion of moist air at page 

 353, totally different from the one alluded to, 

 and calculated for every 10° of the hygrometer 

 and for every 5"" of the thermometer (Reau- 

 mur's) from Schmidt's own experiments ; that 

 column of it which is for saturated air, or when 

 the hygrometer is at 100% I shall extract, as 

 being the only one to my purpose, and the one 

 which Kirwan evidently intended to give; along 

 with which I shall place a corresponding table of 

 expansion calculated from my own experience, 

 or rather from the theory to which it led me. 

 I adopt Schmidt's numbers for the expansion of 



■^ Versucha uber die cxpansiykraft dichte, und latcntt 

 hitzc de8,rem(i^n wfisserdampfes bey verschicdenen tempe- 

 raturen, und uorr die ' ausdehnung dor trockneii uud 

 icuchton Luft dnrch die T\"ormo. 



