Steam Engines in Cornwall. 459 
ence produced in various publications by Mr. George Stephen- 
son and his friends, Spee oe ntly to the meeting of the Coal- trade, 
which was held on the 18th of March 1816, and from the do- 
cuments which have been read at this meeting, that Mr.Stephen- 
son did not discover the fact that explosions of fire-damp will 
not pass through tubes and apertures of small dimensions, and 
did not apply that principle to the coustruction of a safety- lamp; 
and that the latest lamps made by Mr. Stephenson are evident 
imitations of the lamps of Sir H. Davy, and even with that ad- 
vantage are so imperfectly made as to be actually unsafe. 
“ That theResolutions now passed be published thrice in theLon- 
don, Neweastleand Durham papers, and in the EdinhurghCourant; 
and that printed copies thereof be sent to the Lords Lieuteuants 
of the two counties, the Lord Bishop of Durham, and the prin- 
cipal owners and lessors of collieries upon the Tyne and Wear, 
. <¢ J. G. Lamuton, Chairman. 
* The chairman having left the chair, the thanks of the meet- 
ing were unanimously voted to him for his able and proper con- 
duct in the chair,” 
STEAM ENGINES {N CORNWALL. 
The following were the respective quantities of water lifted one 
foot high with one bushel of coals by thirty-four engines, re- 
ported by Messrs. Lean in the month of November, 
Loud per square 
Pounds of water. | inch m cylinder. 
26 common enginesaveraged 21,290,401 various. 
Woolf’s at Wheal Vor -. 934,376,633 19-4 lib. 
Ditto Wh. Abraham .. 34,251,269 10-9 
Ditto ditto .. ow 415,269,317, 16°8 
Ditto ditto Ve ese, 220 ,603 4:3 
United Mines engine . .. 35, 247,309 18-1 
Treskirby ditto .. 34,169, 262 10°4 
Wheal Unity (Woolf's) .. 34,328,944 13°h 
To Mr. Tilloch. 
Sin,—My visit to the Isle of Man has precluded me the plea- 
sure of perusing the latter numbers of your journal ; this circum~- 
stance must be my apology for not ear lier noticing some remarks 
preferred on the opinion | advanced relative to the results of the 
functions of vegetable being. Absence from home prevents any 
reference to my authoritics, nor in my estimation is any thing 
like this called for, in a particular manner 20, seeing there is 
nothing new elicited, as has been very properly observed by your 
correspondent. 
If my memory does not much deceive me, Sir Humphify Davy 
has 
