200 ACCOUNTS, ETC., OF THE BRITISH MUSEUM. 



bered, labelled, and incorporated with the Collection, and many 

 specimens belonging to the Geological Society's collection have 

 been registered. 



The preparation of the slip-catalogues of the mineral- 

 specimens in the Collection, species by species, and of permanent 

 labels giving all available information for each specimen, has 

 been continued for the Divisions of the Haloids, Oxides, and 

 Carbonates. In the course of this work slips have been prepared 

 for the specimens of xanthosiderite, beauxite, psilomelane, wad, 

 hollandite, chalcophane, and calcite ; permanent labels have 

 been written for the specimens belonging to thirty-eight species 

 in the Haloid Division, twenty-six species in the Oxide Divi- 

 sion, and for all the specimens of calcite in the Crystal and 

 Introductory Collections ; and descriptive labels have been 

 written for the species cuprite, spinel, magnetite, chromite,. 

 uraninite, and chrysoberyl. 



The slip-list of the more valuable specimens in the Collec- 

 tion has been brought up to date, and the position of each of 

 the specimens in the Collection has been noted. 



458 new labels for locality, species, variety, pseudomorphs, 

 meteorites, and meteorite-casts have been printed and placed in 

 the exhibition cases to replace written labels, and the corre- 

 sponding entries have been made in the alphabetical and topo- 

 graphical indexes of localities. 



The slip-catalogue of rocks in the species collection has been, 

 completed, and the preparation of an alphabetical list of rock 

 names represented in the Collection has been in progress. 



One hundred and eighty thin-sections of rocks have been 

 microscopically examined and catalogued. 



The preparation of a copy of the register of the specimens 

 in the Collection has been continued, and permanent labels 

 containing particulars drawn from the register have been 

 prepared for the specimens of minerals acquired during the 

 year. 



III. — Pre2)aration. 



Two hundred and eighty-four thin-sections of rocks and 

 meteorites have been prepared. 



A mould and casts of the Wold Cottage meteorite and a 

 cast of the Daniel's Kuil meteorite have been prepared. 



IV. — Investigation. 



A crystallographic investigation of a large additional series 

 of specimens of zeolites from Co. Antrim has been made. Many 

 crystals, including some complex twins of chabazite, have been 

 measured and a new mode of twinning has been noted. Speci- 

 mens of phacolite and gmelinite have also been chemically 

 analysed. Crystals of the following species have been 

 measured : — Calaverite, calcite, cohenite (from the Coahuila 



