122 
Table shewing the number of Explosions occurring in each month 
of the year, and the mean difference between the Barometer 
readings on the days of Explosions, and at certain other times. 
A Height on day of Explosion. 
B Height on day before. 
C Height on day but one before. 
D Mean Height of the month. 
E Mean Height of the whole period. 
No. of 
Months. 
Explosions. 
A: B 
A:C 
A : D 
A : E 
January . . . 
4 
—.163 
—.110 
-f.024 
— .215 
February . 
6 
—.109 
—.159 
—.029 
— .188 
5 
—.222 
—.162 
—.162 
—.533 
3 
—.139 
—.092 
4-.005 
—.355 
May 
4 
—.192 
—.253 
—.125 
—.307 
10 
—.119 
—.131 
—.014 
—.235 
July 
6 
—.061 
—.119 
—.054 
—.156 
August 
7 
—.079 
—.067 
—.011 
—.083 
September . . 
7 
—.178 
— .236 
—.076 
—.208 
October 
14 
—.071 
—.160 
—.087 
—.308 
November . . 
5 
—.425 
—.400 
—.206 
—.577 
December . . 
8 
—.147 
—.189 
—.188 
—.294 
ON WATER SPRINGS AND THEIR RELATION TO MANUFACTURES. 
BY JOHN JEBSON, ESQ., C.E., OF HUDDERSFIELD. 
The connection of water springs with manufactures, and 
the influence of one over the other, is a subject of consider- 
able importance, and worthy of a careful investigation by 
this society, for, without an adequate supply of water, the 
staple trade and the towns of the West Riding would 
thereby be seriously affected in a commercial, domestic, 
and sanitary point of view. Many difficulties have to be 
surmounted before we can obtain this essential element in 
proper quantity and quality, as many have painfully expe- 
rienced ; and many circumstances have to be taken into 
consideration in relation to a good supply of water for the 
purposes named, before the object aimed at can be obtained. 
For instance, locality has a most important bearing on the 
