Natural Ilistory. 93 



the average. On the whole, it is a work that fills a decided need, 

 and the subject is presented in a manner very creditable to the 

 author. g. p. c. 



1. The British Freshwater Rhizopoda and Heliozoa ; by the 

 late James Cash, assisted by John Hopkinson. Volume II, 

 Rhizopoda, Part U. Pp. xviii, 166, with 16 plates, of which 10 

 are colored. London (Ray Society). 1909. — This is the second 

 of the three volumes of the Monograph on these widely dis- 

 tributed groups of Protozoa, the iirst volume, including the 

 Amcebina and a part of the Arcellida, having been published in 

 1905, while the third volume is promised for an early date. Of 

 the Conchulina, or case-bearing Rhizopods, the present volume 

 describes some 80 species belonging to 14 genera, all of which 

 are illustrated. As many of the species occur not only in Great 

 Britain, but also in America and other parts of the world, the 

 book will have a wide sphere of usefulness. For students of 

 North American zoology it will form a valuable supplement to 

 Leidy's superbly illustrated Monograph on the North American 

 Freshwater Rhizopods, published some thirty years ago by the 

 U. S. Geological Survey of the Territories. w. e. c. 



3. Guide to the Genera and Classification of the North 

 American Orthoptera ; by Samuel Htjbbaed Scudder. Pp. 89. 

 Cambridge, 1897 (Edward W. Wheeler). — A key for the use of 

 entomologists, with bibliographical notes to date of publication. 



w. E. c. 



4. Nature Study by Grades : A Text-book for Lower Gram- 

 nier Grades/ by Hokace H. Ctjmmings. Pp. viii, 208. New 

 York, 1910 (American Book Company). — This attractive little 

 book consists of topics for two years' work in nature study, 

 adapted to children of ten or twelve years of age. The subject 

 is divided into 120 lessons, each of which furnishes suggestions 

 which should encourage the pupil to observe the familiar phe- 

 nomena of nature and the properties of the common things about 

 him. w. E. c. 



5. The Body and its Defences ; by Frances Gumck Jewett. 

 Pp. viii, 342, illustrated. Boston and New York, 1910 (Ginnand 

 Company). — Essentially a practical discussion in simple language 

 of the natural conditions which prevail in the human body, to the 

 end that the reader may clearly understand the baneful effects of 

 unhygienic living. The penalties which may thus result from 

 ignorance or disregard of the proper care of the bodily mechan- 

 ism are vividly illustrated, and practical advice is given as 

 to how, by cooperation with the natural defences of the bodyj 

 such penalties may be largely avoided. 



This book carries a message that should impress the reader, be 

 he schoolboy or adult, wilh a higher sense of his responsibility 

 for the welfare of his own body. w. r. c. 



6. A Synonymic Catalogue of Orthoptera ; by W. F. Kieby. 

 Vol. Ill, Orthoptera Saltatoria. Part II (LocustidiB vel Acridi- 

 idse). Pp. vii, 674. London, 1910 (printed by order of the 



