276 NA T U RE- STUD Y RE VIE W [16 :6— Sept. , 1920 



proves him to be an ideal nature study teacher; "Harriet, Little Mountain 

 Climber" which gives a detailed account of the ascent of Longs Peak by Mr. 

 Mills with six year old Harriet Peters which is a re^relation of the ability of the 

 small child for mountaineering. 



For the world at large the most important chapter is "The Evolution of 

 Nature Guiding" which voices the long-felt want for guides who know the 

 animals, birds; trees, plants and geology of the wilderness. Mr. Mills says: 



"It is probable that nature guiding will become a nation-wide and distinct 

 profession, and, though different, rank with the occupations of authors and 

 lecturers. A nature guide is a nalfuralist who can guide others to the secrets 

 of nature. Every plant and animal, every stream and stone, has a number of 

 fascinating facts associated with it and about each there are numberless 

 stories." 



We predict that this volume wiU have a wide and beneficient influence for 

 it is sure to be as useful as it is interesting. 



Zoology, A Textbook for Colleges and Universities, by T. D. A. Cockerell, 

 Professor of Zoology, University of Colorado, pages i-xii, 1-558, figures 

 211, World Book Company, Yonkers-on-Hudson, New York, 1920. 



This volume is a comprehensive, philosophical resume of life reaching back 

 to the lowly protozoa and from tliis basis tracing various lines of development 

 and discussing the more important factors which have played a part in the 

 modification of life. It differs widely from many zoologies in that great stress 

 is laid upon the vital reactions and comparatively little space devoted to the 

 purely systematic. It is a discussion of characteristic types of developing 

 life rather than a record of conditions in existence at a stated period. The 

 author keeps the mutability of life constantly before the reader. It is a 

 human document, a digest of man's interpretation of the animal world and 

 as such, it occasionally turns from the purely zoological to sympathetic and 

 inspiring accounts of the life work of such master builders as Mendel, Charles 

 Darwin, Linnaeus, Fabre, Pasteur, Louis Agassiz and Baird and here and there 

 one may find evidences of the author's personal contributions to a better 

 explanation of the mysteries of life. 



An excellent idea of the scope of the work outside the usual zoological 

 divisions may be obtained from a scrutiny of certain chapters as for example: 

 The Physical Universe, a few pages defining the place of life in the universe. 

 The Living Substance, a suggestive discourse on protoplasm. The Cell and 

 Its Activities, an exposition of the possibilities and limitations of the cell. 

 Respiration, a discussion of the fundamentals and variations in this function. 

 Mendelism, a brief presentation of certain laws of heredity. Social life, an 

 outline of community activities and their expression in man. Alcohol and 

 Heredity, a suggestive explanation of the injurious effects following the use of 

 alcohol. Natural Selection, a summation of the important factors affecting 

 development. The Florissant Shales of Colorado, a brief account of one of 

 nature's treasure houses. The Evolution of Man, a recapitulation of the 

 principal stages in the development of the human type. The Biological 

 Regions of the World, a descriptive outline of the chief faunal areas. History 

 from a Biological Point of View, a plea for the recognition of the historical 

 value of biological changes or reactions and their effect upon nations. All of 



