C iv 3 
XV. Observations on the Change of some of the proximate Prin- 
ciples of Vegetables into Bitumen ; with analytical Experiments 
on a peculiar Substance which is found with the Bovey Coal. 
By Charles Hatchett, Esq. F. R. S. p. 385 
XVI. On two Metals , found in the black Powder remaining 
after the Solution of Platina. By Smithson Tennant, Esq. 
F. R. S. p. 411 
XVII. On a new Metal, found in crude Platina. By William 
Hyde Wollaston, M. D. F. R. S. p. 419 
ERRATUM 
In Part I. page 145, line 20, for 9199, read 9919. 
The three Plates in the second Part are numbered VII. VIII. IX 
instead of VI, VII, VIII: 
