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POPULAR SCIENCE MONTHLY. 



part, comprising seventy-eight pages, is de- 

 voted to a consideration of methods, and is 

 much the more important portion from a 

 popular standpoint, because it really amounts 

 to a discussion of the legitimacy of psychol- 

 ogy as an experimental and exact science. 

 The second part discusses " time " in its 

 various psychological aspects. In Parts III 

 and IV energy and space are respectively 

 taken up. It will be seen from these head- 

 ings that there is an attempt to divide the 

 subject in a way analogous to that used in 

 the study of physics. The last thirty pages 

 of text, entitled Past and Present, give a 

 brief history of the methods, speculations, 

 and men connected with the study of psy- 

 chology since the days of the Greeks. The 

 book contains numerous drawings and illus- 

 trations, and several useful tables and for- 

 mulae, as appendices. 



Mr. Bullock's Introduction to the Study of 

 Economics * fulfills well the exact purpose 

 implied in its title. The first three chapters 

 — which relate to the growth of the United 

 States and their population, their land ten- 

 ures and systems of labor, the growth of 

 their foundational institutions, of the fur 

 trade, cattle raising, fisheries, and mining, 

 and manufactures and transportation — aim 

 to familiarize the student with an orderly 

 treatment of some leading facts in the eco- 

 nomic history of the United States before 

 the study of economic theory is begun. 

 Throughout the book economic principles are 

 discussed with special reference to American 

 conditions, and their workings are illustrated 

 by frequent allusions to American experi- 

 ence. The subjects of wealth, its consump- 

 tion, production, and distribution, exchange, 

 money, credit, bimetallism, monopolies, inter- 

 national trade, wages, land nationalization 

 and socialism, and the economic functions of 

 Government are thus treated ; while public 

 finance has been only incidentally touched 

 upon, and it has not been considered expe- 

 dient to attempt to discuss taxation within 

 the special limits of the volume. We have 

 been much struck with the clear presenta- 

 tion made of principles and doctrines, of the 



* Introduction to the Study of Economics. By 

 Charles Jesse Bullock. Boston, New York, and 

 Chicago: Silver, Burdett & Co. Pp. 571. Price, 



$1.38. 



strong common sense that pervades the au- 

 thor's observations, and the general sound- 

 ness of his views. A bibliography of the 

 special subject is given at the close of each 

 chapter, and a general bibliography of twen- 

 ty-five pages and a copious index will be 

 found at the end of the book. 



The Natural History of the Concise 

 Knowledge Library * is an admirable exam- 

 ple of the manner in which much information 

 may be presented satisfactorily in a small 

 space. It is a book that may be held in the 

 hand and is legibly printed, yet it covers the 

 whole animal kingdom, and each department 

 is treated by an expert in it, distinguished as 

 an authority and an oiiginal investigator. It 

 well fulfills its aim, as defined in the preface, 

 to be concise and popular, at once accurate 

 in statement, handy in form, and ready of 

 reference. While giving all the technical 

 names, the authors have sought to express 

 themselves as much in English as possible. 

 Hence in the text the technical terms are 

 rendered in their English equivalents, or, 

 where there are none such, explained in the 

 vernacular in such a way that the most un- 

 learned may understand what is meant. Mr. 

 Lydekker even goes so far as to apologize 

 for using so little technical a word as " mam- 

 mals," because it has no English equivalent, 

 " beasts " excluding man, and quadrupeds 

 excluding man and the higher apes, and in- 

 cluding lizards, etc. The text is preceded by 

 a concise systematic index, giving the com- 

 plete classification, and followed by an alpha- 

 betical index, containing about ten thousand 

 references and occupying forty-six pages. 



The rapid onward march of science has 

 made necessary the revision of what was a 

 thoroughly up-to-date book on optics f fifteen 

 years ago. The changes we find in the new 

 edition of Professor Le Conte's " Sight," are 

 mainly in the form of additions. The prin- 

 cipal of these are in Part I : a fuller expla- 



* The Concise Kncwledge Library : Natural 

 History. By R. Lydekker, R. Bowdler Sharpe, 

 W. F. Kirby, W. Garstang, B. B. Woodward, P. 

 A. Bather, R. Kirkpatrick, H. M. Bernard, and R. 

 I. Pocock. New York : D. Appleton and Com- 

 pany. Pp. 771. Price, $2. 



t Sight. An Exposition of the Principles of 

 Monocular and Binocular Vision. By Joseph Le 

 Conte. New York : D. Appleton and Company. 

 Pp. 318. Price, $1.50. 



