CONTENTS. 
I The Bakerian Lecture. Experiments and Calculations re- 
lative to physical Optics. By Thomas Young, M. D, F. R. S. 
page i 
II. Continuation of an Account of a peculiar Arrangement in the 
Arteries distributed on the Muscles of slow-moving Animals , 
&c. In a Letter from Mr. Anthony Carlisle to John Symmons, 
Esq. F. R. S. p. 17 
III. An Account of a curious Phenomenon observed on the Glaciers 
of Chamouny ; together with some occasional Observations con- 
cerning the Propagation of Heat in Fluids. By Benjamin Count 
of Rumford, V. P. R. S. Foreign Associate of the National 
Institute of France , &c. &c. p. 23 
IV. Description of a triple Sulphur et, of Lead , Antimony, and 
Copper, from Cornwall; with some Observations upon the various 
Modes of Attraction which influence the Formation of mineral 
Substances, and upon the different Kinds of Sulphur et of Copper. 
By the Count de Bournon, F. R. S. and L. S. p. 30 
V. Analysis of a triple Sulphur et , of Lead, Antimony, and Copper, 
from Cornwall. By Charles Hatchett, Esq. F. R. S. p. 63 
VI. Observations on the Orifices found in certain poisonous Snakes , 
situated between the Nostril and the Eye. By Patrick Russell, 
M. D. F. R. S. With some Remarks on the Structure of those 
Orifices ; and the Description of a Bag connected with the Eye, 
met with in the same Snakes. By Everard Home, Esq. F. R. S. 
p. 70 
