223 
seems to be the fact that more moisture is found in the air 
to a height 34ft. from the ground, at least, during January 
than in any other month of the year, and that the least of 
it is found in May and June. In the same table I give the 
amount of the mean humidity of the atmosphere, calculated 
from observations of the dry and wet bulb hygrometer, by 
means of Glaisher s tables. These results will be found 
almost entirely identical with the ratios of differences of 
rainfall, and seem clearly, and at once, to point to the cause 
of the differences of rainfall between the higher and lower 
gauges. 
1876. 
Ratios of sticli 
rainfall for 1876. 
Ratios of such 
rainfall for 
average of nine 
years, from 1867 
to 1876. 
Mean humidity 
of the atmo- 
sphere for nine 
years, from 1867 
to 1876. 
January 
•762 
•709 
•874 
February 
•803 
•764 
•856 
March 
•804 
•788 
•840 
April 
•801 
•837 
•770 
May 
•930 
•998 
‘753 
June 
•784 
•867 
•751 
July 
•965 
•904 
•761 
August 
•823 
•836 
•793 
September 
•914 
•862 
•778 
October 
•908 
•841 
•841 
November 
‘905 
•798 
•856 
December 
•803 
•801 
•872 
Annual Eatios 
•850 
•833. 
•812 
In the next table I give the fall of rain for 1876, during 
the day, from 8 a.m. to 8 p.m., and the fall during the night 
from 8 p.m. to 8 a.m. There does not at present seem to be 
any rule manifest as to the frequency of when the day fall 
shall exceed the night fall, or the reverse. From 1868 to 
1873 the day fall always was greater than the night fall. 
But, in 1874, the night fall was in excess, and in 187o the 
