CONTENTS. ' 



Extrart from a Me7noir by M. Mathieu, on the Dhctrverf 

 of several Blocks of Orbicular Granite recently found in 

 Corsica • • . . 2:23 



On the Torpidity of Animals ., 241 



Description of a Hydro -pnenmatic Table for collecting and 

 tranif'crr27ig Gases, and for experimenting on permanently 

 elastic Fluids 24/ 



On Salmon Fry : in Answer to a Correspondent .. 251 



On the supposed Fresh-wafer Origin of the Gypsum Strata 

 in the Environs of Paris ; on the Geological Characters 

 and lielations of the Alum Shales on the Northern Coasts 

 if Yorkshire: and on the Orbicular Blocks of Sienite 

 on Mount- Sorrel Hill, in Leicestershire • • , , 256 



On a Method (f examining the Divisions of astronomical 

 Inst'^ummts 277 



On Azimuthal Refraction .. 287 



Second Findication of Dr, HerscheVs Theory of Colowe^ 

 Rings, in Answer to aT anonymous Reviewer , : 289 



Report made t<) the French Institute on a Memoir uf 

 • . Dklaroche on the Air -bladder of Fishes ... 29.1 



Description of an improved Apparatus for t lie Deco^r^posl- 

 tion of Potash and Soda .. , 321 



On the Composition and Decomposition of Forces, Trans'- 

 lated from " Traite elementaire dc Statiqut*, par Gas- 

 pardMonge.. .. .. 323 



Pescriplion of the French Telegraphs used on the Coasts of 

 Flanders, &^c. with Observations on ilie same, and a Plan 

 of a Polygrammalic Telegraph on a new Construction 339 



Account of the Uliynn Dykes in the Neigh hour hood of the 

 Giant's Causeway, Bally castle, and BelfiSt ., 364 



The Bakerian Lecture for 1809. On some new Electro-che- 

 mical Researches on various Objects, particularly the me- 

 lallic BodteSffrom the Alkalies, and Earths, and on some 

 Combinations of Hydrogen ,, •• ,, ,, . 401 



Obsei'vor 



