PHILOSOPHICAL 
TRANSACTIONS. 
I. An Account of the Difcovery of the 
Manner of making Ifinglafs in Ruffia ; 
with a particular Defcription of its Ma- 
nufacture in England, from the Produce 
of Britifh Fifoeries. In a Letter from 
Humphrey Jackfon, Efq\ F. R. S. to 
William Watfon, M. D . F. R. S. 
S I R, 
Read Nov. 19, TTOUR diftinguifhed zeal to pro- 
X mote fcience in general, and par- 
ticularly fuch arts as tend to improve the commerce 
Vol. LX1II. B of 
