DEPARTMENT OF MINERALOGY. 161 



quantitative chemical analyses have been made. Rock- 

 specimens have heen selected, labelled and arranged as a 

 Volcanic Exhibit illustrating the recent eruption in the West 

 Indies. In this connection specimens of bombs and of 

 volcanic dust from St. Vincent and Martinique have been 

 examined. 



In the Chemical Laboratory, 10 quantitative analyses have 

 been made, viz., of Serendibite : Forsterite from Ceylon ; 

 Coloradoite (2) ; Phonolitic Trachyte from Cape Adare ; 

 Kenytes from Mt. Kenya (2); Phonolite from Mt. Kenya: 

 Phonolitic Obsidian and Pantellerite from the Great Rift 

 Valley. Further, 63 doubtful minerals have been qualita- 

 tively analysed. The chemical examination of the Crumlin 

 meteorite has been in progress. 



Publications. 



During the year 1902 the following papers relative to 

 specimens in the collection have been published in the 

 " Mineralogical Magazine and Journal of the Mineralogical 

 Society " by members of the Staff of the Department : — 



1. The Cerargyrite Group (holohedral-cubic silver haloids) ; 



by G. T. Prior, M.A., f.g.s. and L. J. Spencer, M.A., 



F.G.S. 



2. The Identity of Kilbrickenite with Geocronite ; and 



analyses of Miersite, Marshite, and Copper- Pyrites ; 

 by G. T. Prior, m.a., f.g.s. 



3. On the remarkable problem presented by the crystalline 



development of Calaverite ; by G. F. Herbert Smith, 



M.A., f.g.s. , with a chemical analysis by G. T. Prior, 



M.A., f.g.s. 



Further, a detailed Report by Mr. G. T. Prior on the 



Rock Specimens collected by the " Southern Cross " Antarctic 



Expedition under Mr. C. E. Borchgrevink, has been published 



in the " Report on the Collections of Natural Plistory made 



in the Antarctic Regions " during the voyage of the " Southern 



Cross." London, f902. 



Miscellaneous. 



An improved form of three-circle goniometer has been 

 constructed for the department by Messrs. Troughton and 

 Simms, and a micro-photographic apparatus by James Swift 

 and Son. With the latter instrument several photographs of 

 thin sections of rocks have been taken ; some of them are now 

 exhibited in the Introductory Cases to the Study of Rocks. 



The whole of the large stock of printed labels has been 

 arranged in specially constructed boxes designed to render 

 them more easily accessible and less liable to injury. Over 

 500 newly printed locality- and other labels have been placed 

 with the specimens in the cases. 



