THERMOMETER, AND RAIN. Dae 
On reference to the quantity of rain that has 
fallen at Manchester during the last 47 years, 
there is a remarkable difference in the average 
quantity for the various periods contained in the 
foregoing tables, which shows the importance of a 
long continued series of observations to obtain a 
satisfactory table of the mean quantity, either for 
each month or the whole year. 
The rain in the first 6 months of the year is to 
that in the last 6 months, almost exactly as 2 to 
3, on the general average, for the last 47 years ; 
and, it cannot fail being remarked, that the tran- 
sition from the wet period of the year to the dry 
one, and vice versa, is very abrupt. December 
is nearly the wettest month of the year, and 
January nearly the driest; there is 115 inch of rain 
of difference. Again, June is one of the dry 
periods, and July is eminently wet ; the difference 
of the rain in these two successive months is | 
inch; this is about twice as great as any other 
difference in two successive months of the year. 
In my former essay (see Vol. III. page 508, 
second series) I have advanced a reason which, 
indeed, is obvious to any one acquainted with the 
constitution of the atmosphere, why the first half 
4D 
