242 
Tenwemiare | Deacssons|Elasogicee| Eiebesier: 
EE RL Ph I ON Ragen 
Jamuary | 37°6 | 35 | o23e | 87 
February 39.1 3.5 0.243 88 
March 38.3 3.9 0.236 84 
April 43-7 6.2 0.289 78 
May 44.2 8.7 0.305 73 
June 52.4 6.2 0.397 81 
July 56.1 7.0 0.450 78 
August 55-5 6.2 0.447 82 
September} 52.6 5.2 0.401 82 
October 46.6 4.1 0.321 87 
November] 40.1 3.3 0.251 89 
December} 37.0 3-4 0.225 89 
Means 45.3 5.1 0.316 83 
The results given in the above Table are not obtained by direct 
observation, but are deduced from daily observations of the dry- 
and wet-bulb thermometer with the help of Glaisher’s 
* Hygrometrical Tables.” There are other results relating to 
atmospheric vapour which might be obtained in the same way. 
But these seem sufficient for our present purpose. The point of 
chief interest is to ascertain the relative humidity of the air in the 
several months and seasons, or “ the quantity of moisture present 
in relation to the quantity required to saturate the air at the 
existing temperature.” It is the amount of vapour made sensible 
to us by condensation ; vapour, previous to condensation, being 
Faitowrya- - 
