310 Proceedings of Philosophical Societies. [April, 



formation, which, it is ascertained, in many parts continues far 

 inland. In a part of this formation, his route from Bushire com- 

 menced ; between which place and Shiraz, the hills are composed 

 of sulphates and carbonates of lime, and the strata often much 

 disturbed. Through a large tract of this country, carbonate of 

 lime is intermixed with the gypsum, but in parts, rocks of pure 

 gypsum occur, and very frequently accompanied by salt. 

 Streams and lakes of salt abound, and there is a considerable 

 one of the latter at Shiraz. Proceeding northward, the route 

 from Shiraz to Ispahan, a distance of about 250 miles, lies over 

 an elevated country, the nature of which is similar to that before 

 described, but the carbonate of lime predominates. Between 

 the village of Gendoo and the town of Yes-dikhaust, Mr. Fraser 

 found clay slate, and a conglomerate rock inclosing pebbles of 

 quartz, greenstone, and limestone, cemented by carbonate of 

 lime ; strata of this aggregate rock alternate with a finer sand- 

 stone. The mountains between Ispahan and Teheran are of a 

 character very different from the preceding ; among them clay 

 slate was observed, and the highest region, which reaches a great 

 elevation, consists of granitic rocks. 



Jan. 2, 1824. — A paper was read " On the Geological Struc- 

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

 Colebrooke." 



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 hard 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 alternating 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 the 

 South of Russia; by the Hon. William T. H. Fox Strangways, 

 MGS." was read in part. 



Feb. 6. — On this day, being the anniversary of the Society, the 

 following gentlemen were chosen as Officers and Council for the 

 year : — 



President.— Rev. W. Buckland, FRS. Prof. Geol. and Min. 

 Oxford. 



Vice-Presidents. — A. Aikin, Esq. FLS.; J. Bostock, MD. 

 FR. and LS. ; G. B. Greenough, Esq. FR. and LS. ; and H. 

 Warburton, Esq. FRS. 



Secretaries.— C. Lyell, Esq. FLS. ; P. B. Webb, Esq. FLS. ; 

 and T. Webster, Esq. 



Foreign Secretary. — H. Heuland, Esq. 



