Wock$ of Herbert Spencer published by D. AppUtcn <t 

 The fliilosophy of Herbert Spencer. 



THE 



PRINCIPLES OF BIOLOGY 



VoL L, 475 pag-es. (Now in press.) 



CONTENTS: 

 PART I. THE DATA OF BIOLOGY. 



L Organic Matter. II. The actions of Forces on Organic Matter. m. Th 

 re-actions of Organic Matter on Forces. IV. Proximate Definition of 

 Life. V. The Correspondence between Life and its Circumstances. 

 VL The Degree of Life varies as the Degree of Correspondence. 

 VII. The Scope of Biology. 



PART II. THE INDUCTIONS OP BIOLOGY. 



L Growth. II. Development. m. Function. IV. Waste and Repair. 

 V. Adaptation. VL Individuality. VTI. Genesis. VHL Heredity. 



IX. Variation. X. Genesis, Heredity, and Variation XI. Classifica- 

 tion. XII. Distribution. 



PART HI. THE EVOLUTION OP LIFB 



I. Preliminary. II. General Aspects of the Special-creatton-hypothesis. 

 HI. General Aspects of the Evolution-hypothesis. IV. The Arguments 

 from Classification. V. The Arguments from Embryology. VL The 

 Arguments from Morphology. VII. The Arguments from Distribution. 

 VlIL How is Organic Evolution caused ? IX. External Factors. 



X. Internal Factors. XI. Direct Equilibration. XQ. Indirect Equiii 

 bration. XIII. The Cooperation of the Factors. XIV. The Converg 

 ence of the Evidences. 



All these works are rich in materials for forming intelligent opinions, even where 

 we are unable to agree with those put forth by the author. Much may be learned from 

 Jiem in departments in which our common Educational system is very deficient. The 

 sctive citizen may derive from them accurate systematized information concerning his 

 highest duties to society, and the principles on which they arc based. He may gain 

 clearer notions of the value and bearing of evidence, and be better able to distinguish 

 between facts and inferences. He may find common things suggestive of wiser thought 

 nay, we will venture to say of truer emotion than before. By giving us fuller reali- 

 tations of liberty and justice his writings will tend to increase onr self-reliance in the 

 r*at emenrency of civilization to which we have been summoned. Atlantic Month!* 



