Geological Society, 313 



He afterwards compares these results with those obtained by 

 Dr. Marcet from water procured from the middle of the South At- 

 lantic J and from the great difference in the saline contents, infers 

 that the water of the island of St. Paul is not merely the water of 

 the neighbouring ocean in a state of dilution, or altered simply by 

 mechanical filtration. 



A paper "On the chalk and flint of Yorkshire, compared with the 

 chalk and flint of the southern counties of England," by James Mit- 

 chell, LL.D., F.G.S., was then read. 



The chalk of Yorkshire, Dr. Mitchell states, is distinguished from 

 that of the southern counties by its great hardness, by its being 

 occasionally of a red colour*, by its being more distinctly stratified, 

 and by its containing veins of calcareous spar. He says, that it is 

 also distinguished by the upper part being always destitute of flints, 

 while in the southern counties the absence of flints in the upper 

 part is an exception. 



The flints of Yorkshire are shown to differ from those of the 

 southern counties by their being almost invariably of a tabular form, 

 constituting regulg,r and well-defined continuous layers ; by being 

 tougher, and breaking into short small fragments, unfitted for the 

 manufacture of gun flints ; by the colour being always greyish or 

 whitish throughout the whole thickness ; the crust not being of a 

 different character from the body of the flint. Nodules of iron pyri- 

 tes are stated to be common in the Yorkshire chalk, but in that of 

 the South of England to be confined to the lower chalk without 

 flints. 



In conclusion the author points out the following resemblance 

 between the Yorkshire chalk and that of the N.E. of Ireland, namely, 

 the great hardness of both, and the common occurrence in both of 

 iron pyrites and veins of calcareous spar. 



A letter was next read from Woodbine Parish, Esq., addressed to 

 George Bellas Greenough, Esq., P.G.S., accompanying a suite of 

 specimens from the neighbourhood of Bognor. 



The collection, referred to in this letter, contained a series of all 

 the fossils hitherto described as occurring in the Bognor Rock, and 

 a suite of specimens of Choanites Kcenigii obtained from the rolled 

 shingle on the beach. Mr. Parish also points out for the first time 

 the existence of chalk on the shore opposite Felpham, between high 

 and low water mark. He states that it may be traced for upwards 

 of a mile in the direction of Middleton j that at the point where it 

 first appears, it is hard and thickly interspersed with flints, but that 

 further on it becomes soft and the flints are less numerous. Mr. 

 Parish procured from it many of the characteristic chalk fossils. He 

 states also that near Middleton, chalk marl has been long dug at 

 low water. 



A notice on the want of perpendicularity of the standing pillars 

 of the Temple of Jupiter Serapis near Naples, by Capt. Basil Hall, 

 R.N., F.G.S,, was afterwards read. 



Capt. Hall observes that the three pillars of the Temple of Serapis 



* See Phil. Mag. and Annals, N.S., vol. ix. p. 434. 

 Third Series. Vol. 6. No. 34?. April 1835. 2 S 



