672 Meteorological Observations. 
higher this point is, the greater is the quantity 
and force of vapour in the atmosphere, as is 
shewn by the table at page 559; and the lower 
it is with respect to the actual temperature’ of 
the atmosphere, the greater is the force of eva- 
poration. . 
1800. July. Mean vapour point for 21 days 
=53°; highest 62°; lowest 4o°.: 
Aug. Mean for 11 days =56°; but too high 
for the monthly mean: highest 60°. 
Sept. Wapour point above 50° for 6 days; 
highest 60°. 
~ Octo. Vapour point mostly below52°; high- 
est 59’. 
1801. May. Vapour point above 50° for 4 
days; highest 55°. 
Fune. Mean for 10 days, 493°; highest, 571°; 
* lowest, 30%. 
- Fuly. Mean for 8 days, 53°; highest, 56°. 
Aug. Mean for 22 days, 541°; highest, 61°. 
Sept. Mean for 14 days, 54°; highest, 60° 
’ Octo. Vapour point for 5 days, map 50°s 
highest, 57°. 
Nov. Highest, 54°; lowest, 22°: 
Dec. Highest, 44°; lowest, 18°. 
* On the 13th. great damage done to potatoes, &c. by 
the cold which accompanied this remarkably low state 
of vapour for the season. It was 46° on the 12th. and 
40° on the 14th, 
