Correspondence — Br. F. A. Bather. 45 



II. — MlNERALOGICAL SOCIETY. 



Anniversary Meeting, November 15. — Professor W. J. Lewis, F.R.S., 

 President, in the Chair. 

 J. H. Collins : Further Notes on Wood-tin. It is concluded that 

 wood- tin, which always contains a good deal of iron oxide and is 

 much more opaque and more soluble than ordinary cassiterite, is the 

 chalcedonic form, the shot-tin having had a concretionary and the 

 botryoidal form a stalagmitic origin. — J. M. Coon : On the Alteration 

 of the Felspar of Granites to China-clay. The action has taken place 

 from within the earth towards the surface below the underground 

 water-level, the water outlets being generally indicated by schorl and 

 quartz veins. The nature of the products of the alteration was 

 discussed. — Professor W. J. Lewis : On Wiltshireite, a new mineral 

 from the Binnenthal. The crystals were tin- white in colour, russet- 

 brown when tarnished ; small, but aggregated in parallel position ; 

 with monoclinic symmetry, a : I : c = 1-587 : 1 : 1-070 : ft = 100° 44'. 

 Paucity of material prevented a chemical analysis, but no doubt it is 

 a lead sulpharsenite. Named after the late Pev. Professor T. 

 Wiltshire. — Arthur Russell : On a new locality of Phenakite in 

 Cornwall. A single specimen showing numerous colourless, prismatic 

 crystals of phenakite was found by him at Wheal Gorland, Gwennap, 

 Cornwall, this year. The specimen obtained from a lode at present 

 worked for wolfram and traversing the granite close to its junction 

 with the killas. 



COREESPOlTIDElsrCE. 



URONTEUS SALLI. 



Sir, — You may like to note that the type-specimen of Bronteus 

 ffalli, H. Woodward (Geol. Mag., Sept. 1910, p. 407), has just been 

 presented by the Directors of the North Devon Athenseum to the 

 Trustees of the British Museum. It is being placed on exhibition in 

 the Geological Department, and is registered I. 13645. The cast, 

 which came to this Museum as part of the Townshend M. Hall 

 Collection in 1886, was a wax squeeze of the holotype, and has been 

 registered I. 2184. Mr. Hall had, however, previously presented 

 two plaster casts, one of the holotype, one of its counterpart which, 

 as stated in the paper, appears to have disappeared from the J. E. Lee 

 Collection. These casts have been registered respectively, I. 13646, 

 L 13647. 



Now neither the original specimen, collected in 1875, nor any of 

 these casts bears on its label any indication that the specimen came 

 from the Lower Middle Devonian, as stated in the legend to Fig. 1 

 (Geol. Mag., Sept. 1910, p. 408). "Middle Devonian" no doubt it 

 is, and "Lower Middle Devonian" it may be; but one would like to 

 have the evidence for this definite statement. 



F. A. Bather. 



October 11, 1910. 



