S^ A COMPARISON BETWEEN THE 



In June, the maximum dew-point was, in London, 62 ® 

 the maximum in Malvern also 62 ° The minimum dew- 

 point, in London, 45° in Malvern, 43° The mean, in 

 London, 51.5° in Malvern 51.1° 



In July, the maximum dew-point, in London, was 69° 

 the minimum 54 ° and the mean 59.4° In Malvern, the 

 maximum 68° the minimum 50° and the mean 55.8° 



In August, the last month of the summer quarter, the 

 maximum dew-point, in London, was 67° the minimum 

 49° and the mean 59.1 ° In Malvern, the maximum 64.5° 

 the minimum 47.5° and the mean 55.8.° 



For the summer quarter — 



Mean Dew -Point. 



London 56.6' 



Malvern 54.2° 



Taking the mean temperature of the summer quarter, and the 

 mean dew-point, as data, we are enabled to estimate 



London. Malvern. 

 The mean elasticity of the vapour in the air (for the season) . .0.492 in.. .0.460 in. 

 The mean weight of vapour (in grains) in a cubic foot of 1 c aqq 5 112 



air (for the season) J 



Thus we find, as would be expected, a less quantity of vapour in 

 the higher locality than in the lower during the summer months. 



In the month of September, the first of the autumnal 

 quarter, the maximum dew-point, in London, was 64° the 

 minimum 47° and the mean 55.8° In Malvern, the maxi- 

 mum 57° the minimum 49.5° and the mean 52.8.° 



In October, the maximum dew-point, in London, 60° 

 the minimum 26° and the mean 48.7.° In Malvern the 

 maximum 55° the minimum 37° and the mean 46.3.° 



In November, the last month of the autumnal quarter, 

 the maximum, in London, was 58° the minimum 34 ° and 

 the mean 43.6.° In Malvern, the maximum also 58° the 

 minimum 28.° and the mean 40.5° 



For the autumnal quarter 



Mean Dew Point. 



London 49.3 



Malvern 46.5 



London. Malvern. 

 Mean elasticity of the vapour in the air (for > q ^gg q oeo 



the season) i 



Mean weight of vapour (in grains) in a / ^ o-jc o qon 



cubic foot of air (for the season) j; .... *.^/ o ... . «5.you 



dryness in the atmosphere, and by exhibiting them in degrees of the thermometer, 

 refers them to a known standard of comparison. By means of appropriate tables, 

 the weight and elasticity of the invisible vapour of the atmosphere may be de- 

 termini. 



