TRANSACTIONS 



of mi: 



AMERICAN PHILOSOPHICAL SOCIETY 



SEW SERIES 



No. I. 



Experiments to (/((ermine the cornparatiw quantities of lltaf 

 evolved in the combustion of the principal varieties of " 

 and Coal used in l/ic United States, for Fuel; and, also, to 

 determint the comparative quantities of Had lost by tin 

 ordinary apparatus made asi of for their combustion. Bj 

 Marcus Boll. — Bead .Ipril 7, I8S6. 



Tun experiments <>n fuel detailed in the following paper. 

 were commenced in November, 1839, and were prosecuted 

 with very little cessation, until June, I8A4; when, in eona 

 quence of absence, together wiili subsequent ill health, tiny 

 wire suspended until May, i s J'>. when ili< \ were again 

 resumed with undiminished interest, and havi been continued, 

 as circumstances would permit, from thai period i" the pn 

 sent 



During the latter of these periods, I was under the necessity 

 of repeating those experiments which had been previously 

 made, in consequence of a defeel discovered in .1 pari of 1I1. 

 apparatus, the removal of which. \\;i> found to changi tin 

 rc-ult>: still, it was rerj satisfactory to find that the variation 



\ (il.. III. A 



