136 
MR. GLAISHER ON THE CORRECTIONS TO BE 
The remarks following- Table VIII. apply equally well to this table ; I may add, 
however, that as the temperature increases from the time of sunrise more rapidly than 
the amount of water necessary to keep the air at the same degree of humidity 
evaporates, the atmosphere becomes farther and farther removed from a state of satu- 
ration ; and this is particularly the case in summer time, between the hour of noon 
and the time of the highest temperature of the air ; for, as the temperature increases 
all this time, whilst the amount of water is stationary or becomes less, it follows 
that the air is more and more removed from the point of saturation, as is shown by 
the increasing numbers with a plus sign between these times in Table XI. 
Table X. — Showing the corrections to be applied to the monthly mean value of the 
water contained within a cubic foot of air at the height of four feet above the soil 
at any hour, to deduce the true mean value of the month from the observations 
taken at that hour. 
Local 
mean time. 
January. 
Feb. 
March. 
April. 
May. 
June. 
July. 
August. 
Sept. 
Oct. 
Nov. 
Dec. 
gr- 
gr. 
gr- 
gr- 
gr- 
gr. 
gr- 
gr- 
gr- 
gr- 
gr- 
gr- 
Midnight. 
0-0 
+ 0-1 
+ 0-1 
+ 0-1 
+ 0-2 
+ 0-3 
-f 0-3 
+ 0'2 
+ 0'2 
+ 0'2 
+ 0'1 
+ 0'1 
1 A.M. 
+ 0-1 
+ 0-1 
-f 0-1 
+ 0-2 
+ 0*3 
+ 0-4 
-|-0'3 
-f 0'3 
+ 0'3 
+ 0'2 
+ 0'1 
-fO'l 
2 
+ 0-1 
+ 0-1 
-fO-1 
+ 0-2 
+ 0-3 
+ 0-5 
-f 0-4 
+ 0'3 
+ 0'4 
+ 0'2 
+ 0'1 
+ 0'1 
3 
+ 0-1 
+ 0-1 
+ 0-1 
+ 0-2 
+ 0-3 
+ 0*5 
+ 0'4 
+ 0'3 
+ 0'4 
+ 0'2 
+ 0'1 
+ 0'1 
4 
+0-1 
+ 0-1 
+ 0-1 
+ 0-2 
-f-0'3 
+ 0-4 
-f 0'3 
-fO'4 
+ 0'3 
•f 0'2 
+ 0'1 
+ 0'1 
5 
+ 0-1 
+ 0-1 
+ 0*2 
+ 0*2 
+ 0-2 
+ 0-3 
-l-0'2 
+ 0'3 
+ 0'3 
+ 0'1 
+0'1 
+ 0'1 
6 
+ 0-1 
+ 0-1 
+ 0*2 
+ 0-2 
+ 0*2 
+ 0*1 
+ 0'1 
-f 0'2 
+ 0'1 
+ 0'1 
+ 0'1 
+ 0'1 
7 
+ 0*1 
+ 0-1 
+ 0-1 
+ 0-1 
+ 0*1 
-0-1 
0-0 
+ 0'1 
+ 0'1 
+ 0'1 
+0'1 
+ 0'1 
8 
+ 0-1 
+ 0-1 
+ 0-1 
0-0 
0-0 
-O'l 
-O'l 
O'O 
O'O 
O'O 
O'O 
O'O 
9 
0-0 
0-0 
0-0 
-0-1 
-0*1 
— 0-2 
-O'l 
-O'l 
-O'l 
O'O 
O'O 
O'O 
10 
0-0 
0-0 
0-0 
— 0-1 
— 0-2 
-0*2 
— 0-2 
— 0'2 
-0'2 
-O'l 
-O'l 
-O'l 
11 
0-0 
-0*1 
-0-1 
— 0-2 
— 0*2 
— 0*3 
-0'2 
-0'2 
-0'2 
-0‘2 
— 0'2 
-0*1 
Noon. 
-0-1 
—0-1 
-0-1 
—0-2 
-0-2 
-0-4 
— 0-2 
-0'3 
-0'3 
-0'2 
— 0'2 
— 0'2 
1 P.M. 
— 0-1 
-O'l 
— 0-1 
— 0-2 
— 0'2 
— 0-4 
-0'2 
-0'3 
— 0'3 
-0'2 
— 0'2 
— 0'2 
2 
-0-1 
-0-1 
— 0-1 
— 0'2 
-0*3 
-0-5 
-0'3 
-0'4 
-0'4 
— 0'2 
-0'2 
— 0'2 
3 
-0-1 
-0-1 
— 0-1 
— 0-1 
— 0-2 
-0-4 
—0-3 
-0'3 
-0'3 
-O'l 
— 0'2 
— 0-2 
4 
— 0-1 
— 0*1 
— 0-1 
— 0-1 
— 0-2 
-0'3 
-0'2 
-0'3 
-0'3 
-O'l 
-O'l 
-O'l 
5 
-0-1 
-0*1 
0-0 
— 0-1 
— 0-2 
— 0'2 
— 0'2 
-0'2 
— 0'2 
-O'l 
-O'l 
-O'l 
6 
-0*1 
0-0 
0-0 
— 0-1 
—0-1 
— 0-2 
-O'l 
-O'l 
—O'l 
-O'l 
O'O 
— O'l 
7 
-0-1 
0-0 
0-0 
-0*1 
0-0 
-O'l 
O'O 
O'O 
O'O 
-O'l 
+ 0'1 
O'O 
8 
— 0*1 
0-0 
+ 0-1 
-0-1 
+ 0-1 
+ 0-1 
+ 0'1 
+ 0'1 
+ 0'1 
-O'l 
+ 0'1 
O'O 
9 
0-0 
0-0 
-fO-1 
+ 0-1 
+ 0-1 
-fO'2 
+0-1 
+ 0'1 
+ 0'1 
+ 0'1 
+ 0-1 
O'O 
10 
0-0 
0-0 
+ 0-1 
+ 0-1 
+ 0-2 
+ 0-2 
-f 0'2 
+ 0'1 
-fO'l 
+ 0'1 
+ 0'1 
O'O 
11 
0-0 
+ 0-1 
+ 0-1 
+ 0-1 
+ 0-2 
+ 0'2 
-+-0'2 
+ 0'2 
+ 0-2 
+ 0-1 
+ 0-1 
O'O 
The sign -j- denotes that the number is to be added, and the sign — denotes that 
the number is to be subtracted. 
