Linncean Society. — Geological Society. 137 



Guana;" by the Rev. Lansclown Guilding, B.A. F.L.S. Com- 

 municated by Sir E. Home, V.P.R.S. 



Feb. 5. — A paper was communicated, entitled " A finite 

 and exact Expression for the Refraction of an Atmosphere 

 nearly resembling that of the Earth ; " by Thos. Young, 

 M.D. For. Sec. R.S. : and the reading was commenced of 

 " The Bakerian Lecture, On certain Motions produced in 

 Fluid Metals by transmitting the Electric Current ; " by J. F. 

 W. Herschel, Esq. F.R.S. 



Feb. 12. — The Bakerian Lecture was concluded. 



Feb. 19. — Various Meteorological Journals and Astronomi- 

 cal Observations were communicated, by Sir Thos. Brisbane, 

 K.C.B. F.L.S. Governor of New South Wales: and a paper 

 was read " On the Semi-decussation of the Optic Nerves ; " 

 by W. H. Wollaston, M.D. V.P.R.S. 



LINN' JEAN society. 



Feb. 3. — A notice was read from Mr. John Hogg, of Nor- 

 ton, Durham, stating that a fine specimen of Falco Chrysaetos, 

 Golden Eagle, was lately shot near the mouth of the Tees ; 

 being the fifth known to have been killed in England. — 

 Among the presents was a Collection of Plants made in a 

 journey through Circassia, Persia, and Georgia; by Lieut. 

 Col. Wright of the Royal Engineers. 



The reading of Mr. Vigors' s interesting paper on the Na- 

 tural Affinities that connect the Orders and Families of Birds, 

 was continued this evening, and also on the 17th. 



GEOLOGICAL SOCIETY. 



Jan. 2. — A paper was read " On the Geological Structure 

 of St. Jago, one of the Cape de Verd Islands ; " by Major 

 Col eb rook e. 



From the observations of the author and the accompanying 

 specimens, it appears that at the landing-place near the town 

 of Porto Prago, in St. Jago, the rock of the cliff is composed 

 of fragments of trap imbedded in a pure white carbonate of 

 lime. The fragments of this breccia are generally small, and 

 none of them rounded by attrition. The cliff, on which 

 stand the batteries and town of Prago, is regularly stratified, 

 and at the bottom are beds of a calcareous sandstone alter- 

 nating with others which contain specimens of a large oyster ; 

 in both of these beds occur pebbles of trap. The stratum 

 which crowns the cliff is from eight to twelve feet in thickness, 

 and consists of trap. 



Jan. 16. — A paper entitled "Outline of the Geology of 

 Vol.63. No. 310. Feb. 1824. S the 



