178 
If these conclusions turn out to be correct, the normal 
temperature at 4,000 feet will be about 104°, and about 152'' 
at 8,000 feet. It may be possible to reduce the temperature 
to such an extent as to secure adequate ventilation at these 
great depths. 
Experiments made at Eosebridge Colliery (the deepest in 
England) to a depth of 2,400 feet, as well as many on the 
Continent, fully support this opinion. The normal temper- 
ature of the coal at the above Colliery is 93°, whereas, the 
temperature is reduced at the face of the workings, to an 
amount varying from 77^" to 63°, according to the length of 
time exposed. 
The importance of this subject cannot be over esti- 
mated, when we consider that the next fifty years will, in 
this district, see the practical exhaustion of the coal now being 
worked within a moderate depth, and that then, we shall be 
compelled to turn our attention to the hidden wealth lying at 
greater depths, under the Permian and other formations over- 
lying the Coal measure. 
It is altogether beyond the range of this paper to do 
justice to so comprehensive a subject; sufficient has, however, 
been said to induce us to confidently believe, that the difficul- 
ties of deep mining will all be overcome in due time by that 
increase of knowledge, in which the record of the past shows 
mining to have made such wonderful progress. 
In conclusion, it is a matter for congratulation that there 
has been achieved in the cause of Education so great a work 
as the Establishment of a College in Yorkshire, where that 
scientific training can be obtained which the country so much 
lacks, and which she must have if she is not to be distanced 
in the race for commercial superiority by foreign nations. 
