Reports & Proceedings — Geological Society of London. 235 



spencerite had previously (Mm. Mag., 18, 76, 1916) been classed as 

 monoclinic, and this is now confirmed by goniometrical measurements. 

 The relationships of the various hydrated zinc phosphates are briefly 

 discussed. A. S. 



X. — Notes on Mimetite, Thauhasite, and Wavellite. By E. T. 

 Wheruy. Proc. U.S. Fat. Mus., 34, 373-81, 1918. 



THE crystals of mimetite described are of unusual habit and rich 

 in forms, several of which are new. A " prism " determination 

 of the mean refractive index gives the value 2-14, agreeing with 

 previous values obtained by the immersion method. New forms 

 were also observed on thaumasite, which is regarded by the author as 

 a sulphate. Wavellite rarely occurs in measurable crystals, but in 

 this instance the development is sufficiently good for the crystals 

 to be measured, the axial ratios being 0-345 : 1 : 0-404. The 

 refractive indices and chemical composition are also determined. 



A. S. 



XI. — Atjgite from Stromboli. By S. Kozu and H. S. Washington. 



Amer. Journ. Sci. (4), 45, 463-9, 1918. 

 niHE results of chemical and optical examinations of the augite, 

 J. occurring in the ashes round Stromboli, are given. In chemical 

 composition it closely resembles other Mediterranean augites, as 

 80 per cent consists of the diopside molecule, the remaining mole- 

 cules being acmite, hypersthene, and an aluminous compound in 

 nearly equal proportions. The refractive indices for sodium light 

 are, a 1-693, /3 1:699, <y 1-719, while the optical axial angle (2V) 

 is 57° 39. A. S. 



XII. — United States National Museum. 

 TI1HE annual report on the United States National Museum for the 

 J_ year ending June 30, 1917, published by the Smithsonian 

 Institution, includes an account of the additions made to the Depart- 

 ment of Geology during that time. The Department was specially 

 fortunate in the acquisition of meteorites, having received by bequest 

 the well-known and important Shepard Collection. Other noteworthy 

 accessions were specimens of ores of metals used for hardening steel, 

 namely tungsten and vanadium. A large number of good mineral 

 specimens and gem-stones were transferred from the Geological 

 Survey, and the palaeontological collections were enriched by the 

 addition of a large number of type-specimens. 



IRIEIPOIRTS ^.TSTID PROCEEDINGS. 



I. — Geological Society of London. 

 1. Parts of the Report of the Annual General Meeting on 

 Eebruary 21, 1919, having already appeared in the Geological 

 Magazine (see March Number, pp. 97, 98, and April Number, 

 pp. 145-6), it is obviously needless to repeat them in further detail 

 here. — Editor. 



