[ S°5 ] 
at the Diftance of above 120 Feet, and Silver 
at yo. The Theory which led me to this Difco- 
very is founded upon two important Remarks, the 
one that the Heat is not proportional to the Quantity 
of Light, and the other that the Rays do not come 
parallel from the Sun. The firft of thofe, which 
' appears to be a Paradox, is neverthelefs a Truth, of 
which one may cafily fatisfy one’s felf, by refleding 
that Heat propagates itfelf even within Bodies; and that 
when one heats at the fame time a large Superficies, 
the Firing is much quicker than when one only 
heats a fmall Portion of the fame. 
I am, &c. 
From the Chateau de Montbard in 
Burgundy, Sept. 1 8. N.S. 1 748. 
Buffon. 
V. An EJfay on Quantity; occafioned by read- 
ing a Lreatife , in which Simple and Com- 
pound Ratio’s are applied to Virtue and 
Merit, by the Rev. Mr. Reid; communi- 
cated in a Letter from the Rev. Henry 
Miles D.D. F.R.S. to Martin Folkes 
Efq\ Pr.R.S. 
Sect. i. 
What Quantity is: 
Read Nov. 3-^1 IN CE mathematical Demonftration 
1748 L 1 is thought to carry a peculiar Evi- 
dence along with it, which leaves no Room for 
further Difpute; it may be of fome Ufe, or Enter- 
tainment 
