20 TRANSACTIONS OF THE [oCT. 26, 



trate and permeate it for ages, might result in mincralogical 

 changes, especially in the direction of hydration. 



Dk. Britton regarded the age and nature of these rocks as a 

 most difficult subject to determine, and one which would be 

 more readily settled by study in the field than by laboratory re- 

 search. He said that the lithologyand mineralogy of Fairmount 

 Pai'k is essentially the same as that of Central Park. But at 

 AVashington, the rocks contain less feldspar, while northward, 

 in the New Jersey Highlands, they arc deficient in mica. 



The President reported that the British geologists were now 

 satisfied, after long discussion between Devonian and Mesozoic 

 indications, that the ''Elgin sandstones " are of Triassic age. 

 The recent discovery of the head of a Dicynodont reptile, simi- 

 lar, in general, to those previously known from the Trias of 

 South Africa, is regarded as conclusive evidence. 



He also briefly described some of the material exhibited at the 

 Geological Congress at Berlin, and the scientific collections in 

 several European cities, particularly those in tiie London South 

 Kensington Museum. 



The Librarian reported the following 



ACCESSIONS to TIIE LIBRARY, 



for October, 1885. 



Great Britain and Ireland. 



Dumfriesshire and Galloway Nat. Hist, and Antiquarian 

 Society. 

 Transactions and Journal of Proceedings, Sessions 1880-81, 

 1882-83. Dumfries, 1884. 

 Edinburgli Geological Society. 



Transactions, Vol. IV., Part III., 1883; Vol. V., Part. I. 

 Edinburgh, 1885. 

 Zoological Society of London. 

 Proceedings, 1885, Part IL 



Transactions, Vol. XT., Part 10. London, 1885. 

 Eoyal Society of London. 



