Opitiions of the Press on the " International Scientific Series." 



The Study of Sociology. 



By HERBERT SPENCER. 

 I vol., I2mo. Cloth Price, $1.50. 



" The philosopher whose distinguished name gives weight and influence to this vol- 

 ume, has given in its pages some of the finest specimens of reasoning in all its forms 

 and departments. There is a fascination in his array of facts, incidents, and opinions, 

 which draws on the reader to ascertain his conclusions. The coolness and calmness of 

 his treatment of acknowledged difficulties and grave objections to his theories win for 

 him a close attention and sustained effort, on the part of the reader, to comprehend, fol- 

 low, grasp, and appropriate his principles. This book, independently of its bearing 

 upon sociology, is valuable as lucidly showing what those essential characteristics are 

 which entitle any arrangement and connection of facts and deductions to be called a 

 science. " Episcopalian. 



" This work compels admiration by the evidence which it gives of immense re- 

 search, study, and observation, and is, withal, written in a popular and very pleasing 

 style. It is a fascinating work, as well as one of deep practical thought." Bo st. Post. 



" Herbert Spencer is unquestionably the foremost living thinker in the psychological 

 and sociological fields, and this volume is an important contribution to the science of 

 which it treats. ... It will prove more popular than any of its author's other creations, 

 for it is more plainly addressed to the people and has a more practical and less specu- 

 lative cast. It will require thought, but it is well worth thinking about." Albany 

 Evening Journal. 



VI. 



The New Chemistry. 



By JOSIAH P. COOKE, JR., 



Erving Professor of Chemistry and Mineralogy in Harvard University. 

 I vol., I2mo. Cloth Price, $2.00. 



" The book of Prof. Cooke is a model of the modern popular science work. It has 

 just the due proportion of fact, philosophy, and true romance, to make it a fascinating 

 companion, either for the voyage or the study." Daily Graphic. 



"This admirable monograph, by the distinguished Erving Professor of Chemistry 

 in Harvard University, is the first American contribution to 'The International Scien- 

 tific Series,' and a more attractive piece of work in the way of popular exposition upon 

 a difficult subject has not appeared in a long time. It not only well sustains the char- 

 acter of the volumes with which it is associated, but its reproduction in European coun- 

 tries will be an honor to American science. " New York Tribune. 



" All the chemists in the country will enjoy its perusal, and many will seize upon it 

 as a thing longed for. For, to those advanced students who have kept well abreast of 

 the chemical tide, it offers a calm philosophy. To those others, youngest of the class, 

 who have emerged from the schools since new methods have prevailed, it presents a 

 generalization, drawing to its use all the data, the relations of which the newly-fledged 

 fact-seeker may but dimly perceive without its aid. ... To the old chemists, Prof. 

 Cooke's treatise is like a message from beyond the mountain. They have heard of 

 changes in the science; the clash of the B9ttle of old and new theories has stirred them 

 from afar. The tidings, too, had come that the old had given way ; and little more than 

 this they knew. . . . Prof. Cooke's 'New Chemistry* must do wide service in bringing 

 to close sight the little known and the longed for. ... As a philosophy it is elemen* 

 tary, but, as a book of science, ordinary readers will find it sufficiently advanced." 

 Utica Morning Herald. 



D. APPLETON & CO., Publishers, 549 & 551 Broadway, N. Y, 



