558 Reports & Proceedings — Mineralogical Society. 



estimate of the relative proportion of the surface of section occupied 

 by pebbles ranged in vertical faces from 3 to 9 per cent and in 

 horizontal faces from 4 to 16 per cent with one exceptional case of 

 32 per cent. (The percentage of the rock mass formed by the 

 pebbles is certainly distinctly lower than the surface percentage.) 

 This condition of the Liverpool Pebble Beds is in marked contrast to 

 the Bunter conglomerate beds of the Midlands (Cannock Chase, etc.) 

 or Budleieh Salterton. 



III. — Mineralogical Society. 



Anniversary Meeting, November 5, 1918. — Sir William P. Beale, 

 Bart., K.C., M.P., President, in the Chair. 



The following were elected Officers and Members of Council: 

 President, Sir William P. Beale, Bart., K.C., M.P. ; Vice-Presidents, 

 Professor H. L. Bowman, Mr. A. Hutchinson ; Treasurer, Dr. J. W. 

 Evans; General Secretary, Dr. G. T. Prior, F.E..S. ; Foreign 

 Secretary, Professor W. W. Watts, F.R.S. ; Editor of the Journal, 

 Mr. L. J. Spencer ; Ordinary Members of Council, Mr. H. Collingridge, 

 Mr. T. Crook, Dr. G. F. Herbert Smith, Dr. H. H. Thomas, 

 Mr. H. F. Collins, Mr. J. P. De Castro, Professor H. Hilton, 

 Lieut. A. Russell, Dr. A. Holmes, Miss M. W. Porter, Mr. R. H. 

 Rastall, Sir J. J. H. Teall, F.R.S. 



The following papers were read: — 



Dr. G. F. Herbert Smith and Dr. G. T. Prior : " On a Plagionite- 

 like Mineral from Dumfriesshire." Specimens of antimony-lead 

 ore collected by Lieut. Russell from Glendinning mine contained 

 small cavities lined with tiny black crystals, measuring less than 

 0'4mm., and mostly less than 0'2 mm. across. Some resembled in 

 habit the crystals of plagionite from the Hartz Mountains described 

 by Luedecke. Measurements made on the three-circle goniometer 

 showed the crystals to belong to the semseyite end of the group, and 

 the result of a chemical analysis of the compact material of which 

 the crystals form part corresponded approximately to the formula 

 5 Pb S . 2 Sbg So. Semseyite has not previously been recorded from 

 the British Isles. 



Lieut. Arthur Russell: "The Chromite Deposits in the Island of 

 TJnst, Shetlands." The bottle-shaped mass of serpentine which runs 

 thi'ough the centre of the island from north to south contains 

 chromite uniformly distributed, but varying greatly in character, 

 being at times massive, but generally granular. Over thirty 

 quarries are known, but only six of them have been worked to any 

 extent. The associated minerals include kammererite (abundant in 

 one quarry), uvarovite, copper, hibbertite, brucite, calcite, talc, and 

 magnetite. The rocks other than the serpentine are poor in 

 minerals. 



Dr. G. T. Prior: "The Nickeliferous Iron of the Meteorites of 

 Bluff, Chandakapur, Chateau Renard, Cynthiana, Dhurmsala, Eli 

 Elwah, Gnadenfrei, Kakowa, Lundsgard, 'New Concord, Shelburne, 

 and Shytal." The percentage of nickeliferous iron and the ratio 

 of iron to nickel in the several instances were found to be 



