cHymistry applied to agriculture. 



" Consequently," adds M. de Saussure, '* I do not think 

 we are far from the truth, in assigning 11 grains of water 

 to saturate a cubic foot of air, at the temperature of 15° 

 of Reaumur," (i=:65°.75 Fahrenheit.) " The solution of 

 these 11 grains of water in a cubic foot of air at the tem- 

 perature of 15° Reaum. (z= 65°.75 F.) increased the den- 

 sity of the air so much, that the barometer, which before 

 was at 27 in., rose to 27 in. 5 ""''' 79,411, that is to say, 

 about 27 in. 6 lines ; consequently, the density of the air, 

 or its volume in the receiver, was increased about J^." 



When the temperature of the air is diminished, the 

 aqueous fluid is condensed, and appears in the atmosphere 

 in the form of vapor, and is deposited in the state of dew. 

 The moisture of the night air from this cause, during the 

 heat of summer, restores vegetation from that state of lan- 

 guor produced by the too great warmth of the day. 



Oxygen and azote have been classed among the simple 

 bodies ; carbonic acid and the aqueous fluid among the 

 compound bodies, of which the principal constituents are 

 known, and which can be formed and decomposed at will. 



27.36 



72.64 



hydrogen 11.06 



. . . oxygen 88.94 



Oxygen and azote constitute, essentially, the atmo- 

 sphere ; since, when the two other principles are separated 

 from it, it still retains nearly all its characters of form, 



100 parts of carbonic acid contain ; 

 100 parts of water contain 



carbon 

 oxygen 



