1893.] Presents. 453 



companied by a very high pressure lasting for a very short time. 

 The experiments of MM. Mallard and Le Chatelier, as well as the 

 author's, show the presence of these fugitive pressures. It is possible 

 that data for calculating the pressures produced may be derived from 

 a knowledge of the densities of the unburnt gases and of their rates 

 of explosion. 



Presents, January 19, 1893. 

 Transactions. 



Baltimore : Johns Hopkins University. Circular. Vol. XII. 



No. 101. 4to. Baltimore 1892. The University. 



Belgrade : Royal Servian Academy. Glas. Nos. 31-35. 8vo. 



Beograd 1892; Spomenik. Nos. 11, 15-18. 4to. Beograd 



1892. The Academy. 



Berkeley : University of California. Memorial of the Character 



and Services of John Le Conte. 4to. [Berkeley'] 1892. 



The University. 



Berlin : Gesellschaft fiir Erdkunde. Verhandlungen. Bd. XIX. 

 No. 8. 8vo. Berlin 1892. The Society, 



Boston : American Academy of Arts and Sciences. Proceedings. 

 Vol. XVIII. 8vo. Boston 1891 ; Memorial of Joseph Love- 

 ring [Obituary Notice]. 8vo. Cambridge 1892. 



The Academy. 



New England Historic Genealogical Society. Rolls of Member- 

 ship, 18441891. 8vo. Boston 1892. The Society. 

 Breslau : Schlesische Gesellschaft fiir vaterlandische Cultur. 

 Jahresbericht. 1891. 8vo. Breslau 1892; Erganzungsheft. 

 Heft 1. 8vo. Breslau 1892. The Society. 

 Brighton : Brighton and Sussex Natural History and Philosophi- 

 cal Society. Abstracts of Papers read, and Annual Report, 

 year ending June 8th, 1892. 8vo. Brighton. 



The Society. 



Brisbane : Queensland Museum. Annals. No. 2. 8vo. Brisbane 



1892. The Museum. 



Royal Geographical Society of Australasia, Queensland Branch. 



Proceedings and Transactions. Vol. VII. Part 2. 8vo. 



Brisbane 1892. The Society. 



Brussels : Academie Royale de Medecine de Belgique. Memoires 



Couronnes et Autres Memoires. Tome XI. Fasc. 5. 8vo. 



Bruxelles 1892. The Academy. 



Bucharest: Societajii de Sciin^e Fizice. Buletinul. Anul I. 



Nos. 5-8. 8vo. Bucuresci 1892. The Society. 



Buitenzorg: 's Lands Plantentuin te Buitenzorg, 1817 1892. 



8vo. Batavia 1892. The Director. 



2 H 2 



