Meteorological Observations at Hudson, Ohio. 275 
Date. Ther. above hygrom. , Rain followed. 
1842, May _ 5, 26°9 7 days. 
Rn. 16, 27°5 22 hours. 
ee ae A 29°5 13.1, % 
“« July . 21, 25°4 | 2 days. 
ie Feb. 26, 25:7 9 hours. 
AarOA te 27°5 } Sad 
25, 28:8 3g 
* re 3, 25:0 Pe. 
“ ‘“ 11, 31-2 45 
“ “ 12, 33-9 a 
= wane: = 31:2 1 eligs 
“Mey. 1 25:6 3 days. 
oe 13, 25-5 15 hours 
3 7 16, 30°3 5 days 
hoa 18, 26:8 F aad 
a 19, 28-9 57 hours 
« rT 1, 25°7 | 
“July 20, 26:9 4 days 
ee 6c 96:2 3 tC 
1844, April 19, 27°5 Bu 
ee ee 8 25°9 oo 
= “une, 12, 25°6 16 hours. 
as follow 
Peruse 1 May, 15 August, 1 
March, 13 June, 2 September, 1 
April, 18 July, 3 October, 1 
Making in all 55 cases, 46 of which have occurred in the spring 
of the year. 
In 25 out of these 55 cases, rain followed in 24 hours. This 
will appear the more remarkable, when it is considered that the 
instances in question were often the driest times in the whole 
month. If we admit that in some instances there was no con- 
hection between the dryness and the subsequent rain, there is 
certainly room to suspect such a connection in other cases. 
Thus, April 2, 1842, when the air had become drier than at any 
' other time during the month, rain followed in nine hours. The 
Same happened in February, 1843. In six instances when the 
thermometer had risen more than 25° above the dew point, rain 
