[ 21 7 ] 
XXVI. A Letter from Mr. Bernard, of 
Deptford, to Mr . Robertfon, Lib. R. S. 
containing a Jhort Account of an Explofon 
of Air , in a Coal-Pit , at Middleton,. 
near Leeds in Yorkfhire. 
S I R, 
Read Feb. 25, "f" Have at length procured, from my 
I773 ‘ father, a memorandum made by him 
on the fpot, of the effects of foul air fet on fire, 
which I have copied exactly. If it affords you the 
leaft fatisfadion, I fhall be well plealed, though late* 
in having fulfilled my promife. 
I am, with great refped. 
Yours,, 
Grove- Street, Deptford, 'W. Barnard. 
January 12, 17^. 
MEM O- 
