SCIENCE-GOSSIP. 



231 



"Reflected, Retuse, or Revolute, when the 

 margin is folded or turned backwards, as in Limnaa 

 peregra, war. labiosa, Jeffreys. 



"Inflected, or Involute, when the margin is 

 folded or turned inwards as in Limnaa auricularia, 

 var. gibbosa, Taylor." 



The author discusses the structure in this first 

 part also of the bivalves, one of which is here given 

 to show his excellence of drawing. 



"Fig. 106. — A 'Crested' Bivalve, Anodonta anitina, var. 

 radiata, Jefir., right valve, River Foss, Blue Bridge, near 

 York. Collected by Rev. W. C. Hey, M.A., showing the 

 anterior and posterior crests of the dorsal margin — a. c. 

 anterior crest, p. c. posterior crest." 



"The Posterior ■ and Anterior Crests are 

 most remarkably developed and most noticeable in 

 immature shells, and mark off the posterior and 

 anterior limits respectively, of the upper and dorsal 

 margin ; the posterior crest is sometimes distinctly 

 and strikingly angulated in adult shell of Anadonta, 

 but in Unio the anterior crest is often the most 

 strongly marked." 



In discussing variation the following figure (137) 

 is given among others : 



"Fig. 137— Unio tumidus, var. oralis, Mont., River Frome, 

 Stapleton, Bristol. Collected by Miss F. M. Hele. Showing 

 the compressed and somewhat curved posterior margin, and 

 the slightly unequal valves." 



If the high character of this first part is as well 

 maintained to the end of the work, and of this 

 there is no reason for doubt, we shall have not only 

 a useful, but a handsome book indeed. — [J. T. C] 



Book Catalogues. We have received Catalogues 

 of second-hand books, chiefly on Natural Science 

 subjects, from William Wesley and Son, London 

 (No. 122, Botany) ; Henry Young and Sons, Liver- 

 pool ; John H. Knowles, 15, Rush Hill Road, 

 London, S.W. (November issue). 



Chapman and Hall, London, have just pub- 

 lished at is., Brief Notes on Physical and Chemical 

 Properties of Soils, for use of science teachers, bv 

 R. Warington, F.R.S. It will be found a valuable 

 aid to teachers of agriculture. 



Catalogue of Minerals and Mineralogical Supplies. 

 (Geo. L. English and Co., 64, East Twelfth Street, 



New York City.) , Sixteenth edition, 1894. 124 pp. 

 Imp. 8vo. 86 figures. 



It is unusual to notice at length books which are 

 trade catalogues. This work, however, stands so 

 completely by itself as a scientific production that 

 we cannot refrain from writing in its favour for the 

 benefit of those interested in mineralogy who have 

 not yet met with it. It is a veritable friend-in-need 

 for the beginner, for from it he may find much to 

 guide him in his studies. It is divided into 

 departments: (1) Crystallography, (2) Physical 

 Mineralogy, (3) Chemical Mineralogy, (4) Miscel- 

 laneous, (5) Descriptive Mineralogy. This latter 

 section is really valuable, as it contains a closely- 

 printed descriptive list, extending over no less than 

 sixty pages, of all known minerals and synonymic 

 names of them. This is preceded by a synopsis of 

 their classification, and has no reference to the 

 price list which appears elsewhere. By the way, 

 the highest priced mineral appears to be aquilarite, 

 which is a sulpho-selenide of silver, found three 

 years ago, specimens costing from 4s. to £10, as 

 against diamonds from 2s. to £2. The index 

 extends over sixteen pages, and to make the work 

 complete a full glossary of terms used is siven, 

 and the chemical formulae, as is also a list of 

 books to work with. — [J. T. C] 



The Royal Natural History. Edited by Richard 

 Lydekker, F.R.S. , etc., Part xiii. (London F. Warne 

 and Co.) Price is. 



Part xiii. contains the aquatic mammals — whales, 

 porpoises, and dolphins. With this work available 

 for identification, the shroud of doubt which 

 generally envelops the newspaper record of " a whale 

 ashore" should for ever disappear. The chapter 

 on rodents is commenced in this part, which also 

 contains the index to vol. ii. of the whole book. 



Forest Birds, their Haunts and Habits : Short Studies 

 from Nature By Harry F. Witherby. 98 pp., 

 8vo, with thirty illustrations from nature. 

 (London : Kegan Paul, Trench, Triibner and Co., 

 Ltd.) Price 2s. 6d. 



This is one of those delightful little books which 

 do more in the cause of popularising observation 



Scene in the New Forest. 

 From "Forest Birds." 



