90 Reviews — Kenpcr Marls arouud Chamivood. 



In turning over the pages a few j^oints call for notice. The carat 

 weight is used for all gemstoiies which have any claim to be accounted 

 ])recious, but for some reason the discussion of it is placed under 

 'Diamond'. It is not made clear that the Board of Trade takes no 

 responsibility for the carat and possesses no standard of it ; it is, 

 indeed, an illegal weight. All the Board has done is to determine 

 the equivalent in milligrams of the carat in use among English 

 jewellers. In the chapter on the cutting of gemstones too much 

 importance is given to the rose-type, which is never found in modern 

 jewellery, and the facets in figs. 11 and 14 are much too steep. 

 It is puzzling to find the pyroxene group (p. 81) placed in the section 

 headed 'lolite', and we look in vain for enstatite, cut stones of which, 

 from South Africa, are sold as 'green garnet'. Andalusite is 

 probably oftener confused with tourmaline than with alexandrite 

 (p. 67). A good supply of rough peridot is usually on the market, 

 and it can scarcely be said " the peridot now put upon the market is 

 generally believed to be derived from old ornaments and jewellery " 

 (p. 71); the remark is, however, applicable to emeralds. We ai'e 

 sorry to see the faulty spelling 'essonite', without the aspirate, 

 perpetuated. Most kuiizite is too lilac in tint to be mistaken for 

 pink topaz (p. 83). 'Adze' is not a word peculiar to the Maoris and 

 need not be italicized (p. 85). The Chairman of the Premier Diamond 

 Mine (Transvaal) Company, after whom the great diamond was 

 named, is Sir T. N. Cullinan (p. 42). ' Burnui ' and 'Burmah' 

 appear within three lines of one another on p. 75. Some mistake has 

 obviously been made in the drawing of fig. 36. The localitj^ for 

 emerald in New South Wales is Emmaville (p. 63). Few, if any, 

 pyropes have a refractive index as high as 1"8 (p. 74). 



Some useful tables and a good index are included at the end of 

 the book. 



IV. — The Kkuper Marls around Charnwood. Bj'^ T. 0. Bosworth, 

 B.A., B.Sc, F.G.S. Being the results of researches in Leicester- 

 shire, 1904-11. pp. 1-129, with 47 illustrations. Leicester: 

 published by the Leicester Literary and Philosophical Society, n.d. 



("CONSIDERABLE additions have been made during the last decade 

 J to the literature of the Trias, a subject to which great attention 

 has been paid hy the Leicester Literary and Philosophical Society. 

 In the present work, a beautifully illustrated volume, are embodied 

 the results of Mr. Bosworth's researches in the Keuper Marls of 

 a district that affords exceptional advantages for study. These results 

 have already been published in various scientific journals, but the 

 collection and arrangement of them in the present volume will be 

 of considerable use to future workers. 



After giving a short account of tlie literature of the subject, the 

 author proceeds to a general sketch of the geology of the district, 

 making reference to the different easily distinguishable kinds of rock 

 that are contained in the Charnian mass. In describing the features 

 of the old rock-surface beneath the Keuper Mai'ls the author takes 

 as a typi<\al illustration the quarry in Groby village, and most of 

 the descriptions of the quarries are accompanied by detailed maps. 



