60 



PROCEEDINGS OF THE AMERICAN ACADEMY 



January 5th, 1866. 



Temperature 10° F. 

 Dew-Point 1°.5 F. 



Fig. 1. 



»i 



D, 



Weight of vapor \ 

 in 1 cubic foot > 0.81 grs. 

 of air, 



December 25th, 1865. 



Temperature 46° F. 

 Dew-Point 33°.4 F. 



Fig. 2. 



Di 



a D, 



"Weight of vapor ) 



in 1 cubic foot > 2.42 grs. 

 of air, 



December 26th, 1865. 



Temperature 55° F. 

 Dew-Point 46°. 5 F. 



November \~th, 1865. 



Temperature 70° F. 

 Dew-Point 64°.0 F. 



Fig. 3. 



Dj S e £ oy D, 



Weight of vapor \ 



in 1 cubic foot > 3.76 grs. 

 of air, 



Fig. 4. 



Di7,6e 4 ay 00 ic D, 



Weight of vapor \ 



in 1 cubic foot > 6.57 grs. 

 of air, ' 



