238 Geological Society. 



the Sociely ; and several presents of books and minerals 

 were announced. 



The reading of Mr. Phillips*s paper on the native oxide 

 of tin of Cornwall, was conchided. 



After describing the primitive figure of this substance, 

 Mr. P. proceeds to an enumeration and description of those 

 modifications with their varieties which have been observed 

 by him, and specimens of which are at present in his ca- 

 binet. 



After describing twelve modifications, the paper con- 

 cludes with details of those compound crystals usually called 

 macles; of the still n)ore compound ones which are formed 

 by the junction of two macles, and of the most complicated 

 of all, which are macles of macles. 



A description of Castle Hill near Newhaven in Sussex, 

 by Hen. Warburton, Esq. Ord. Mem. Geo. Soc. was read. 



Castle Hill is a small circular elevation composed of 

 nearly horizontal beds, lying above the chalk in the fol" 

 lowing order, beginning from the most recent : 



1. Sand and rounded fiint ptbbies. 



2. A congeries of oyster shells. 



3. A bed of broken bivalve shells, chiefly of the genus 

 Venus. 



4. A bed of blue clay inclosing a seam of martial py- 

 rites three or four inches thick, composed entirely of casts 

 of bivalve and turbinated shells. 



5. A bed of indurated marl, the lower part of which ;s 

 obscurely slaty, and contains between its laminae, leaves 

 apparently of some tree of the willow tribe converted into 

 coal. 



6. A seam of coal three or four inches thick. 



7. Marl of a sulphur yellow colour, including large cry- 

 stals of gypsum.. 



8. Sand. 



9. Chalk. 



A notice respecting an accidental sublimation of silex, 

 by Dr. M'Culloch, Ord. Mem. Geo. Soc. was read. 



A mixture of the oxides of tin and lead was put into an 

 earthen crucible, and covered by another inverted over it: 

 the mass was exposed to a high heat, and on opening the 

 crucibles the empty part of each of them was found lined 

 with capillary shining crystals; which by the usual me- 

 thods of analysis proved to be pure silex. 



WERNEBJAN 



