DEPARTMENT OF MINES ALOGY. 155 



III. — Pre'paration. 



Two hundred and thirty-three micro-sections of minerals, 

 meteorites, and rocks have been prepared. 



Coloured plaster casts have been made of the Appley Bridge 

 meteorite. 



IV. — Investigation. 



The crystallographic and optical investigation of the series of 

 crystals of lead and copper minerals from Eed Gill, Cumberland, 

 and Leadhills, Lanarkshire, in the Trechmann Collection, has 

 been completed, and a description has been prepared for pub- 

 lication. 



Among other species which have been examined for purposes 

 of identification or other reasons may be mentioned, minerals from 

 Tanganyika Territory, Northern Nigeria (zircon, corundum, 

 «tc.), Ceylon (zircon, librolite, etc.), and Madagascar (chrysoberyl, 

 betafite, columbite, etc.); crystals of tin compounds from tin 

 furnaces (tin sulphide, iron stannide, tin arsenide) ; fibroferrite 

 from Cyprus; manganite from Cumberland. 



The investigation of the metamorphic rocks represented in the 

 collections of the " Terra Nova " Antarctic Expedition has been 

 in progress, and descriptions have been prepared of rocks from 

 Evans Cove, McMurdo Sound, and Granite Harbour. 



Rock-specimens from Islands off the coast of Peru, from 

 Darfur, and from Somaliland ; specimens of riebeckite-rhyolite 

 from Kordofan; and of *' blood-rain " and sands from the 

 Canaries, have been examined, and descriptions have been pre- 

 pared for publication. 



In the Chemical Laboratory a complete quantitative analysis 

 has been made of the Ensisheim meteorite. Many minerals have 

 also been qualitatively analysed. 



V. — Departmental Library. 



Cataloguing and Press -mar king. — All the accessions, includ- 

 ing 809 plates, have been catalogued and stamped ; 69 volumes 

 have been pressmarked or re-pressmarked. 



Proofs of the General Library Catalogue (Supplement) have 

 been read and checked against the slip-catalogue in the Depart- 

 ment. 



Accessions. — 31 volumes of separate works, 80 periodicals, 

 351 pamphlets, 21 mining and survey reports, and 12 sheets of 

 maps have been added to the Library. 



Binding. — 96 volumes have been bound. 



VI . — Publications . 



A new short guide to the Mineral Gallery has been prepared 

 for press. 



The following papers relating to specimens in the Collection 

 have been published in the Mineralogical Magazine and Journal 

 of the Mineralogical Society, 1920, vol. xix. : — 



The classification of Meteorites : by G. T. Prior (p. 51). 



