402 
not bear severe labour in such a temperature, and science, 
the mind of the age, must then make some arrangement 
by which this difficulty might be obviated. I have found 
by a series of experiments, extending over several years, 
that in the cold days of winter when the air on the surface 
was fifteen or twenty degrees, with a current of 100,000 
cubic feet of air passing into the pit in a minute, ice 
was not seen at the bottom of a shaft 1,000 feet deep, and 
seldom in one 600 feet deep. When the surface temperature 
was thirty- two degrees, the temperature at the foot of the shaft 
was forty- two degrees; and at 800 yards from the foot of the 
shaft, the intake current was sixty degrees, which I found to 
be uniform during the winter and summer months, or nearly 
so; for, with the same quantity of air passing in, and a surface 
temperature of seventy degrees, the temperature at that point 
was sixty-one degrees. 
At the conclusion of the Meeting, the Assistant Secretary 
read the annexed financial Report of the Society for the past 
year : — 
STATEMENT OF RECEIPTS AND EXPENDITURE 
Of the Geological and Polytechnic Society of the West Riding of Yorkshire. 
From May, 1863, to May, 1864. 
DR. 
£. s. 
d. 
CR. £. s. 
d. 
By Subscriptions — 
Messrs. Baines, on account for 
From 9 Members for 1862 . 
. 5 17 
0 
Printing 22 10 
G 
„ 67 „ 1863. 
. 43 11 
0 
Philosophical Society for Rent 
„ 10 „ 1864. 
. 6 10 
0 
0 
Collecting Subscriptions 0 15 
6 
Postages and Postage Stamps . . 17 
(3 
6 
Assistant Secretary on account 12 0 
0 
Carriage of Parcels and Sundry 
Expenses 0 14 
8 
4 
£55 18 
0 
£55 IS 
0 
