Vlll 



1804-. 



The Bakerian Lecture. Experiments and Calculations relative to phy- 

 sical Optics. By Thomas Young, M.D. F.R.S page 131 



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 132 



An Account of a curious Phenomenon observed on the Glaciers of 

 Chamouny ; together with some occasional Observations concerning 

 the Propagation of Heat in Fluids. By Benjamin Count of Ruinford, 

 V.P.R.S 133 



Description of a triple Sulphuret, 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 Sulphuret of Copper. By the Count 

 de Bournon, F.R.S. and L.S 134 



Analysis of a triple Sulphuret, of Lead, Antimony, and Copper, from 



Cornwall. By Charles Hatchett, Esq. F.R.S 138 



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 138 



An Inquiry concerning the Nature of Heat, and the Mode of its Com- 

 munication. By Benjamin Count of Rumford, V.P.R.S 139 



Experiments and Observations on the Motion of the Sap in Trees. In 

 a Letter from Thomas Andrew Knight, Esq. to the Right Hon. Sir 



Joseph Banks, Bart. K.B. P.R.S 147 



Analytical Experiments and Observations on Lac. By Charles Hat- 

 chett, Esq. F.R.S 148 



On the Integration of certain differential Expressions, with which 

 Problems in physical Astronomy are connected, &c. By Robert 



Woodhouse, A.M. F.R.S 150 



Observations on Basalt, and on the Transition from the vitreous to the 

 stony Texture, which occurs in the gradual Refrigeration of melted 

 Basalt ; with some geological Remarks. In a Letter from Gregory 



Watt, Esq. to the Right Hon. Charles Greville, V.P.R.S 151 



An Analysis of the magnetical Pyrites ; with Remarks on some of the 



other Sulphurets of Iron. By Charles Hatchett, Esq. F.R.S. ... 155 

 Remarks on the voluntary Expansion of the Skin of the Neck, in the 

 Cobra de Capello or hooded Snake of the East Indies. By Patrick 

 Russell, M.D. F.R.S. With a Description of the Structure of the 

 Parts which perform that Office. By Everard Home, Esq. F.R.S. . 157 

 Continuation of an Account of the Changes that have happened in the 

 relative Situation of double Stars. By William Herschel, LL.D. 



F.R.S 158 



Observations on the Change of some of the proximate Principles of 

 Vegetables into Bitumen ; with analytical Experiments on a pecu- 

 liar Substance which is found with the Bovey Coal. By Charles 

 Hatchett, Esq. F.R.S 159 



