480 



Scientific Intelligence. 



gives a good summary of the literature, and is well illustrated by- 

 four plates containing many figures of recent and Paleozoic 

 Ctenostomata. p. e. r. 



4. An attempt to Classify Paleozoic Batrachian Footprints. 

 Trans. Roy. Soc. Can., 2d ser. vol. ix, Sec. IV, p. 109, 1903. New 

 Genera of Batrachian Footprints of the Carboniferous System 

 in Eastern Canada. Can. Rec. Sci., vol. ix, No. 2, p. 99, 1903; 

 by G. F. Matthew, LL.D. — These articles are complementary 

 to each other. The first takes a wider field of view than the 

 second, viz. : the described Carboniferous, tracks of America, 

 supposed to have been made by Batrachian animals, and is an 

 endeavor to classify these footprints according to their forms, 

 and the number of toes represented. The author does not 

 think the presence or absence of a tail mark or central groove 

 between the rows of footmarks of the right and left limbs of 

 general classificatory value, as some tracks which are closely alike 

 in other respects are distinguished mostly by this marking ; and 

 the "tail mark" may be absent from one part of a trail and 

 present in another. 



A table is given at page 111 of the first paper in which the 

 tracks of the Lower Carboniferous and the Coal Measures are 

 arranged according to the number and the weight of the toe- 

 impressions, etc. 



Plates show some of these characteristic tracks, and give 

 figures of new genera proposed. It is stated that no European 

 footprints of Carboniferous age were considered in this classifi- 

 cation and description of American forms. 



5. Geology; by Thomas C. Chamberltn and Rollin D. 

 Salisbury. In two volumes. Vol. I, Geologic Processes and their 

 Results, xix and 654 pp., 24 pis., with three tables of water 

 analyses. New York, 1904 (Henry Holt & Company). — This 

 volume, printed in clear type upon a heavy grade of paper, illus- 

 trated by numerous original drawings and photographs, both well 

 selected and reproduced, possesses a distinctive character and fills 

 a place not quite occupied by any other manual. The methods 

 of treatment, as stated in the preface, bring especially to the front 

 the methods of action and developmental aspects of the geologic 

 agencies. Careful distinctions are drawn between those principles 

 well founded on observed facts and others which have usually 

 been as commonly accepted but which ultimately depend upon 

 hypotheses as to the origin or internal nature of the earth. In 

 the less certain departments of geological knowledge the method 

 of multiple or alternative hypotheses is developed and the student 

 shown the limitations of present real knowledge upon the subject. 

 The first chapter consists of a preliminary outline on the field of 

 geology, following which are chapters upon the work of the 

 atmosphere, of surface and underground water, of snow and ice, 

 structural geology, movements and deformations of the earth's 

 body, extrusive processes and the geologic functions of life. The 

 reputation of the authors in their several specialties is a sufficient 



