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NOTICES OF NEW BOOKS. 



Yorkshire's Contribution to Science. By T. Sheppard, M.Sc, 

 F.G.S., etc. London : A. Brown & Sons, Ltd. 1916. 5s. net. 

 In this neat volume of nearly 260 pages Mr. Sheppard has a great 

 deal to tell us not only about Yorkshiremen in their relation to 

 science, but other subjects of more general interest, for not only does 

 he devote sections to a topographical review of Yorkshire publica- 

 tions, and to Yorkshire scientific magazines living and extinct, but 

 he has a most interesting and valuable summary of general natural 

 history journals, many of which, of course, are now things of the 

 past — for extinction seems to be the usual fate of such ventures — and 

 of the publications of scientific societies, including those dealing with 

 geology and archaeological matters. An index to these concludes the 

 work, which begins with a bright presidential address by Mr. 

 Sheppard to the Yorkshire Naturalists' Union. We note two 

 important omissions in the list of journals not specially concerned 

 with Yorkshire — no mention is made of the ' Avicultural Magazine ' 

 or of ' Bird Notes,' nor of the Avicultural Society and the Foreign 

 Bird Club, by which they are respectively published ; yet these 

 journals deserve attention if only for the beauty and utility of their 

 coloured illustrations, to say nothing of their often including items 

 of wide scientific interest. But this is but a slight blemish in a 

 valuable and generally scholarly work. 



Growth in Length. By Bichard Assheton, M.A., Sc.D., F.B.S., 

 Cambridge University Press. 1916. 2s. 6d. net. 

 The first part of this posthumous work has been prepared for 

 publication by the author's widow, with the assistance of Professors 

 Stanley Gardiner and J. P. Hill ; the figures, which number forty- 

 two, are from the author's sketches. The sub-title is '• Embryological 

 Essays," and the first part of the book comprises three lectures 

 given as one of the " Advanced Courses of Zoology " in the University 

 of London, under the title of " The Growth in Length of the Verte- 

 brate Embryo." The second part is a reprint of a paper on the 

 "Mechanics of Gastrulation," which appeared in the ' Archiv fiir 

 Entwicklungsmechanik der Organismen ' in 1910 ; it will be particu- 

 larly appreciated by those interested in embryology, because further 

 copies are now unobtainable. A full bibliography is given, and the 

 whole length of the work, which is well got up, is 104 pages. 



