Meteorological Observations at Hudson, Ohio. 275 
Date. Ther. above hygrom. Rain followed. 
1842, May 5, 26:9 7 days. 
het i 16, 27°5 22 hours. 
LR [= Ny 29°5 Tage 
ce  SULY ye, 25°4 2 days. 
1843, Feb. 26, 25°7 9 hours. 
oe areh 7, 27°5 1S Mal 
66 6 25, 28:'8 5 eee? 
ot April, . 3, 25°0 Kea AG 
tc 7 11, 31-2 AR & 
7 3 te, 33-9 yt 
-" eas ea, 31:2 1 a 
CTE es aaa iP 25°6 3 days. 
Ce REL 13, Paws 15 hours. 
so aa se 16, 30°3 5 days. 
i “ 18, 26:8 SPC 
cee eee isp "28:9 _ 57 hours. 
¢ cc 21, 25:7 OS CE 
July. 220, 26°9 A days. 
ee ee 21, 26-2 ee 
1844, April 19, 275 Bigs 
ham | ch ae! B 259 ee: 
ec  Sune 12, 25:6 16 hours. 
‘The distribution of these dry days for the seven years has been 
as follows: 
February, lL 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- 
nection 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 
