648 



NATURE 



[February 10, 19 16 



careful thought and invention on the part of the 

 company's experts. 



The concluding portion of this chapter deals in 

 an especially interesting manner with the details 

 of the receiving sets employing the Marconi mag- 

 netic detector, the crystal, and the Fleming oscil- 

 lation-valve detectors. The balanced crystal and 

 valve-detectors used for eliminating atmospheric 

 disturbances are extremely well described. Chapter 

 V. in part iii. is occupied with a description of 

 the 5-kilowatt "battleship" set, which has par- 

 ticular interest at the present moment. 



The following chapter is concerned with the 

 portable and pack sets used in military work. 



For a reader, even although not professionally 

 a wireless telegraph operator, who has some 

 general electrical knowledge, this practical part 

 of the book will have considerable interest, and it 

 can be strongly recommended as containing a 

 concise, detailed account of the apparatus most 

 used in the conduct of those wonderful feats of 

 wireless telegraphy to which so many travellers 

 by sea have owed escape from death. Altogether, 

 the book is a useful addition to the library of 

 the wireless telegraphist, and its excellent illus- 

 trations and good make-up are creditable to both 

 authors and publishers. A very good feature is 

 the intermingling of photo reproductions showing 

 the actual appearance of the apparatus, with well- 

 drawn schemes of connections showing the 

 arrangement of the circuits. 



OUR BOOKSHELF. 

 Manual of the Ne%v Zealand Mollusca. By H. 

 Suter. Atlas of plates ; 72 plates with descrip- 

 tions. (Wellington, N.Z. : John Mackay, 

 Government Printer, 1915.) n.p. 

 The appearance of this volume of plates completes 

 the publication of Mr. Suter's "Manual of New 

 Zealand Mollusca." Nearly every species de- 

 scribed in the text has been figured, thereby en- 

 hancing the value of the work as a book of 

 reference. The illustrations reach a high level of 

 excellence, and the figures generally are clear, 

 well drawn, and adequate In detail. The least 

 satisfactory are those on plates 2, 7, and 50, in 

 which the details are so obscured that the figures 

 are almost useless. 



The weakest part of this volume is that devoted 

 to Nudibranchs. Only fifteen out of thirty-seven 

 species are illustrated, and only eight of these 

 figures (plates 36 and 37) are sufficiently good to 

 aid in the identification of species. These Mollusca 

 must be studied alive, and the figures drawn and 

 reproduced in colour to be of any service. The 

 difiSculties of obtaining such figures and the high 

 cost of reproduction have doubtless precluded 

 their use in this work. The explanations of the 

 figures are accompanied by a note of the actual 

 size, presumably of the specimen figured, and 



NO. 2415, VOL. 96] 



references to the text, details for which those who> 

 use the work will thank the author. 



We renew our congratulations to Mr. Suter 

 and the New Zealand Government on the publica- ^ 

 tion of this volume of plates. The author has- 

 earned the thanks of conchologists the world over> 

 and particularly of students of Mollusca in the 

 Dominion, for undertaking the work and for the 

 thoroughness and care with which it has been 

 done. W. M. T. 



Morphology and Anthropology. A Handbook for 



Students. By Dr. W. L. H. Duckworth. 



Volume i. Second Edition. Pp. xiv + 304. 



(Cambridge: At the University Press, 1915.) 



Price I05. 6d. net. 

 In the eleven years which have elapsed since Dr. 

 Duckworth's indispensable manual made its first 

 appearance, there has been a rapid growth in all 

 those branches of knowledge on which " Morph- 

 ology and Anthropology " are based. This is 

 especially the case as regards our knowledge of 

 the anatomy of the Primates — particularly of the 

 anthropoid apes. Hence in the present edition of 

 his manual Dr. Duckworth has found it necessary 

 to expand that section which deals with the 

 anatomy of the Primates and with the position of 

 the Primates in the mammalian phylum to such 

 an extent that it now appears as a separate 

 volume. In its present shape this volume gives 

 an excellent introduction to a systematic study 

 of the anatomy of man and of the animals which 

 are closely related to man in structure and in 

 origin. So far as we know, there is no other 

 book in the English language which covers the 

 same ground. 



By turning over and comparing the pages of 

 'the present and past editions, particularly the illus- 

 trations, one is struck by the progress made 

 during the past eleven years. During that time 

 the cortical areas of the brain of man and every 

 group of ape has been worked out ; Dr. Duck- 

 worth has chosen excellent figures to represent 

 this and other aspects of our progress. This 

 volume is more of the nature of a new work than 

 of a new edition, so much has it been rewritten, 

 expanded, and in every way improved. 



Heaton's Annual. The Commercial Handbook 

 of Canada and Boards of Trade Register, igi6. 

 Pp. 506. (Toronto: Heaton's Agency; Lon- 

 don : Simpkin, Marshall, Hamilton, Kent and 

 Co., Ltd.) Price 55. 

 The twelfth issue of this useful yearly work of 

 reference contains, in addition to its usual con- 

 tents, which have been described on previous 

 occasions, a new section entitled "Where to find 

 it." This part provides a guide to Dominion and 

 Provincial Government reports and other standard 

 publications showing those contents of interest to 

 travellers, intending settlers, and others, and how 

 the reports and books indexed may be procured. 

 The volume may be commended especially to 

 teachers of commercial geography who should find 

 its mass of conveniently arranged informatior» 

 invaluable. 



