[ J 9+ ] 
Hubner’s kind, here mentioned, is only a variety of 
that I call creta , tripela alba ditt a, p. 76. N° 1. Your 
Lordfhip will pleafe to obferve, that of all the faid 
kinds none are produced in general by any iuch ope- 
rations of nature, as Mr. Hubner intimates ; therefore, 
my Lord, reafon will convince, that this is only a 
partial and local origin of his Tripoli, by concurring 
circumftances of wood and Tripoli buried together in 
the bowels of a volcano ; for as we find this very fpe- 
cies elfewhere produced without fuch circumftances, 
it is certain they are not the foie efficient caules of 
its production. 
I am, with great fubmiffion and refpeCt, 
My Lord, 
Your Lordfhip’ s moft devoted, 
moft obliged, and moft obedient 
humble fervant, 
Bearbinder Lane, Emanuel Mendes da Cofta. 
19 June, 1759- 
XXII. A remarkable Cafe of an Empyema. 
By Mr. Jofeph Warner, F. R. S. and Sur- 
geon to Guy’* Hofpital. 
Read June 28, IV dT ORRIS EVANS, aged 30 years, 
XVjL 011 the 13th of March, 17^9, was 
admitted into Guy’s hofpital, with a remarkable com- 
plaint in his cheft, which attacked him in the month 
of Auguft 1758, with the fymptoms of a pleurify. 
Upon 
