PHILOSOPHICAL 
TRANSACTIONS. 
XIV. New Experiments upon Heat. By Colonel Sir Benjamin 
Thompfon, Knt. F. R. S, In a Letter to Sir Jofeph 
Banks, Bart . P. R. S. 
Read March 9, 178$. 
DEAR SIR, 
T : HAVE at length begun the courfe of experiments upon 
■'*' heat which I have fo long had in contemplation ; and I have 
already made a difcovery, which, if not new to you, is perfectly 
fo to me, and which I think may lead to a further knowledge 
refpe&ing the nature of heat. 
Vol. LXXVL O o Examining 
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