68 Notices reJtpecting New Books. 



an iron ore. The clay tracts of the Wealrls belong to it. This 

 formation may bo also seen at Sandovvn Bay, Blackgang, and 

 Gompton chines, .Swanwich-bay, Hastings, Tonbridge Wells, &c. 

 Fossil shells are rarely found in it, but carbonized wood is met 

 with in abundance. 



Purleck Shell Limestone. — This formation consists of nume- 

 rous beds of shells and fragments of shells cemented together by 

 calcareous spar, and alternating with shells and marl. The Pur- 

 beck, and perhaps the I'etworth marbles, form part of this se- 

 ries : and it is further remarkable for containing numerous fresh- 

 water shells, and bones of the turtle : hence it is not improbable 

 that part of it may have been fornied in fresh water. 



Clay with Gypsuvi. — At Swanwich in Dorsetshire this is dug 

 under the shell limestone. The gypsum does not occur in great 

 quantity, but is employed for ])lastcr. 



Portland Oolite. This includes the stone of Tillywhino and 

 Windspit (juarries, called the Purbeck Portland, and that from 

 Portland island. It is entirely calcareous, and is formed of. 

 small grains or concretions adhering together. It is the only 

 stone used for the fronts of public buildings in London. Some of 

 its beds contain many marine fossils, also fossil wood and chert. 



Bituminous Shale containing the Kimmeridge Coal. — This 

 maybe seen at Kimmeridge, Encombe, and the Isle of Portland. 

 It is the lowest stratum visible in that part of the country to 

 which the above observations have extended. 



XVI. Notices respecting New Books. 



aVL^. Murray's Elements of Chemical Science, second edition, 

 with additions, is in the press, and will be forthwith published 

 bv Messrs. Underwood of Fleet-street. 



This edition will contain a succinct and lucid view of those 

 discoveries which have of late distinguished the rapid and brilliant 

 march of chemical science. 



The article on safety-lamps for mines, and account of experi- 

 ments made by the new blow-pipe with a condensed mixture of 

 oxygen and hydrogen, will possess considerable interest. 



Dr. Spurzheim is engaged in publishing a full reply to the va- 

 rious reviews and other writers who have opposed his peculiar 

 doctrine of the brain. — His large work on Insanity is nearly ready 

 for the press. 



Mr. Copland Hutchison, late Surgeon to the Royal Naval Ho- 

 spital at Deal, &c. has in the press " Some further Observations 

 on the Subject of the proper Period for amputating in Gun-shot 

 Wounds ; accompanied by the official Reports of the Surgeons 

 employed in His Majesty's Ships and Vessels at the late Battle 

 before Algiers." 



