t 73 ] 
verting wood into charcoal in a hill, and condense 
ing the vapor—the charcoal would repay the ex¬ 
pense of the operation, particularly where wood 
was cheap. If the pyrites is in lumps it must be 
reduced to a coarse gravel before burning. 
I WRITE to you in too much haste, lest I loose the 
conveyance, not to render an apology necessary, 
but you will have the goodness to excuse my inac¬ 
curacy and put nay information into such form as 
you shall deem best to render it acceptable. 
I PRAY you to present my respectful homages tc 
the gentlemen of the society at large, and my par¬ 
ticular remembrances to my numerous friends a- 
mong them, and to be assured yourself of the sin¬ 
cere esteem, with which 
I have the honor to be, dear sir, 
Your most ob’t humble serv’t. 
ROB, R. LIVINGSTON. 
Pr. De Witt, S-ecfry to the\ 
^ogisty for n.sefid arts,, ^c. ^ 
