Miscellaneous Scientific Intelligence. 227 



habits and reactions to stimuli of the various species, with an 

 account of their very abundant parasites and commensals and a 

 detailed discussion of their coloration. 



So exhaustively is the subject treated and so well executed and 

 elucidative are the illustrations that the crinoids may now be 

 removed from their former association with the little-known 

 groups of animals and placed among those most thoroughly 

 investigated. w. R. c. 



3. Source Book for the Economic Geography of North 

 America; by Charles C. Colby. Pp. xi, 418; with 11 maps in 

 black and white. Chicago, 1921 (The University of Chicago 

 Press) . — This volume is a compilation of 119 articles, from nearly 

 as many different authors and statistical sources, assembled here 

 in 14 chapters. The first chapter, entitled Regional Concepts of 

 Canada, contains six articles dealing successively with the size, 

 agricultural regions, land and water areas, climate, mineral 

 resources of the major physiographic provinces, and the popula- 

 tion of Canada. Chapter II deals with the resources and indus- 

 tries of Canada, and is followed by five chapters dealing with the 

 separate geographic subdivisions: Maritime Canada (and New- 

 foundland), St. Lawrence Lowland, Laurentian Upland, Prairie 

 Provinces, and Pacific Canada. A similar procedure is followed 

 for the LTnited States and Mexico. 



The purpose of the book is to furnish source material for an 

 introductory study of the geography of North America and to 

 introduce students to the literature of the subject. A large 

 amount of interesting, valuable, and highly diversified informa- 

 tion has been assembled, ranging from the apple industry in 

 Nova Scotia to the genesis of the ores at Butte, Montana. It will 

 be seen that ample scope is left for the ingenuity and resourceful- 

 ness of the instructor to unify so broad a body of information. 



ADOLPH KNOPF. 



4. Ueber die Vorstellungenen der Tiere: ein Beitrag zur 

 Entwicklungspsychologie; von Hans Volklet. 126 pp. Leip- 

 zig und Berlin, 1914 (Wilhelm Engelmann). — This is the second 

 part of a series of studies on the origin and evolution of mental 

 processes and the psychology of human actions. The present 

 volume on animal intelligence analyses the presumable percep- 

 tions and conceptions of various types of animals with regard to 

 the hypothesis of total environmental complexes. w. r. c. 



5. Le Movement scientifique contemporain en France: 1, Les 

 sciences naturelles; par Georges Matisse. Pp. 160. Paris, 

 1921 (Payot & Cie.). — This little book indicates the recent devel- 

 opment of the natural sciences in France by summarising the 

 work of such eminent biologists as Delage on heredity and par- 

 thenogenesis, of Bataillon on artificial parthenogenesis, of Hous- 

 say on dynamic morphology, of Cuenot on preadaptation, of 

 Bohn on tropisms, and of other French investigators who are 

 leaders in various branches of biology. w. r. c. 



