60 



PROCEEDINGS OF THE AMERICAN ACADEMY 



January 5th, 1866. 



Temperature 10° F. 

 Dew-Point lo.5 F. 



Fig. 1. 



Di 



D, 



Weight of vapor \ 

 in 1 cubic foot > 0.81 grs. 

 of air, J 



Deceviber 25th, 1865. 



Temperature 46° F. 

 Dew-Point 33°.4 F. 



Fig. 2. 



Di 



a /3 Dj 



Weight of vapor \ 



in 1 cubic foot > 2.42 grs. 

 of air, ^ 



December 26th, 1865. 



Temperature 55° F. 

 Dew-Point 46°.5 F. 



November \7th, 1865. 



Temperature 70° F. 

 Dew-Point 64°.0 F. 



Fig. 3. 



Di S e i ay fi Dj 



Weight of vapor \ 



in 1 cubic foot > 3.76 grs. 

 of air, ' 



Fig. 4. 



DlTjSe i ay pe kD^ 



Weight of vapor \ 



in 1 cubic foot > 6.57 grs. 

 of air, ' 



