1886.] 



Presents. 



291 



to be mentioned. It is now well established that on exploding gaseous 

 mixtures "within a closed chamber, the maximum theoretical tempera- 

 ture is never reached ; and this has hitherto always been explained 

 as due to the occurrence of dissociation whereby the change is re- 

 tarded. If in a mixture, say, of carbonic oxide, oxygen and water 

 gases, the three kinds of molecules act together in the manner I have 

 supposed, it is probable that the extent to which they mutually 

 influence each other would vary with the temperature, and that it 

 would tend to diminish above a certain temperature ; if such were 

 the case, change would be retarded in the manner in which it appears 

 to be in explosions within closed chambers. Dissociation undoubtedly 

 does take place in many cases, but there is now a considerable amount 

 of evidence on record to show that the bounding surfaces exercise a 

 most important influence ; this is usually not sufficiently taken into 

 account. 



Presents, February 4, 1886. 



Transactions. 



Bern: — Jsaturforschende Gesellschaft, Mittheilungen. 1884, 



Heft 3; 1885, Hefte 1-2. 8vo. Bern. The Society. 



Budapest : — Kon. Ungar. Geolog. Anstalt. Mittheilungen. Bd. VII. 



Heft 2. 8vo. Budapest 1885 ; Foldtani Kozlony. KQtet XIV. 



Fiizet 9-11. 8vo. Budapest 1881 ; General-Index der Ungar. 



Geolog. Gesellschaft, 1852-1882. 8vo. Budapest 1884. 



The Society. 



Buenos Ayres :--Academia Xacional de Ciencias en Cordoba. Actas. 

 Tomo V. Entrega 2. 4to. Buenos Aires 1884. 



The Academy. 



Calcutta : — Asiatic Society of Bengal. Journal. Vol. LIV. Part II. 



Nos. 1-2. 8vo. Calcutta 1885 ; Proceedings, Nos. 6-8. 8vo. 



Calcutta 1885. The Society. 



Catania : — Accademia Gioenia di Scienze Naturali. Atti. Serie 3. 



Tomo XVIII. 4to. Catania 1885. The Academy. 



Copenhagen: — Academie Boyale. Bulletin. 1885. No. 2. 8vo. 



Copenhague. Sir J. Lubbock, Bart., F.R.S. 



Dresden • — Verein fur Erdkunde. Jahresbericht XXI. 8vo. 



Dresden 1885. The Association. 



Dublin : — Royal Geological Society of Ireland. Journal. Vol. XVI. 



Part 3. 8vo. Dublin 1886. The Society. 



Graz : — Naturwissenschaftlicher Verein fiir Steiermark. Mittheil- 

 ungen. Jahrg. 1884. 8vo. Grate 1885. The Union. 

 Leeds: — Philosophical and Literary Society. Annual Report. 



1884-85. 8vo. Leeds 1885. The Society. 



