WORKS OF HEEBEET SPENCER, 



rCDLISIIED BY 



D. APPXiETON Al^D COMPANY. 



SYSTEM OF PHILOSOPHY. 



I.— FIRST PRINCIPLES. 

 {New and Eidargcd Edition.') 

 Paht I. — The Unknowadlk. 

 Pakt II.— Laws op the Kxowadle. 



559 pages. Price, $2.60 



II.— TDE PRINCIPLES OF BIOLOGY.— VOL. I. 

 Paut I. — The Data of Biology. 

 Pakt II. — The Inductions op Biology. 

 Pakt III. — The Evolution or Life. 



475 pages. Price, ........ $2.60 



PRINCIPLES OF BIOLOGY.— VOL. II. 

 Part IV. — Mouphological Development. 

 Pakt V. — Physiological Development. 

 Paut VI. — Laws op Multiplication. 



565 pages. Price, $2.50 



III.— THE PRINCIPLES OF PSYCHOLOGY. 



Pakt I. — The Data op Psychology. 144 pages. Price, - - $0.75 



Part II. — The Inductions of Psychology. 140 pages. Price, - $0.75 

 Part III. — General Synthesis. 100 pages. ) „ . 



Part IV.— Special Synthesis. 112 pages. ^ A rice, - . fl.OO 



MISCELLANEOUS. 



I.— ILLUSTRATIONS OF UNIVERSAL PROGRESS. 

 Thirteen Articles. 451 pages. Price, ..... $2.50 



IL— ESSAYS : 



Moral, Political, and .Esthetic. 



Tk.v Essays. S80 pages. Price, ...... $2.60 



III.— SOCIAL STATICS: 

 Or the Co.sditions Es.'sential to Human Happiness Specified, and this 

 First of them Developed. 

 623 pages. Price, $2.50 



IV.— EDUCATION : 



Intellectual, Moral, and Physical. 



283 pages. Price, $1.25 



v.— CLASSIFICATION OF THE SCIENCES. 

 60 pages. Price, ... - ..... $0.26 



VL— ^SPONTANEOUS GENERATION, &c. 

 16 pages. Price, . . ... $0.25 



