a eee | 
To elucidate what I have wrote, I inclofe a plan and feCion 
of the workings in the bottom of a coal mine, and a fection of 
the ftrata at Blakelow. I fhall be happy if this attempt to pro- 
mote the caufe of fcience meets your approbation, 
And am, Sir, 
Your moft obedient, humble fervant, 
ABRAHAM MILLS. 
Fence-houfe, near Macclesfield, Chefhire, 
Od. 30, 1789. 
RICHARD KIRWAN, Efq; 
