WOKKS OF HEEBEET SPENCEE, 



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D. APPLETOIST A3STD COMPANY. 



SYSTEM OF PHILOSOPHY. 



L FIRST PRINCIPLES. 

 (New and Enlarged Edition.) 

 PART I. THE UNKNOWABLE. 

 PART II. LAWS OP THE KNOW ABLE. 



559 pages. Price, - $2.50 



II. THE PRINCIPLES OF BIOLOGY. VOL. I. 

 PART I. THE DATA OP BIOLOGY. 

 PART II. THE INDUCTIONS OF BIOLOGY. 

 PART III.-r-TuE EVOLUTION OF LIFE. 



475 pages. Price, $ 2 - 50 



PRINCIPLES OF BIOLOGY. VOL. II. 

 PART IV. MORPHOLOGICAL DEVELOPMENT. 

 PART V. PHYSIOLOGICAL DEVELOPMENT. 

 PART VI. LAWS OF MULTIPLICATION. 



565 pages. Price, - - $ 2 -50 



III. THE PRINCIPLES OF PSYCHOLOGY. 



PART I. THE DATA OF PSYCHOLOGY. 144 pages. Price, - - $0.75 

 PART II. THE INDUCTIONS OF PSYCHOLOGY. 146 pages. Price, - $0.75 

 PART III. GENERAL SYNTHESIS. 100 pages. ) p . 

 PART IV. SPECIAL SYNTHESIS. 112 pages. f-tuce, 



MISCELLANEOUS. 



L ILLUSTRATIONS OF UNIVERSAL PROGRESS. 

 THIRTEEN ARTICLES. 451 pages. Price, ..... $2.50 



II. ESSAYS : 



MORAL, POLITICAL, AND ESTHETIC. 

 TEN ESSAYS. 886 pages. Price, $2.50 



III. SOCIAL STATICS: 



OR THE CONDITIONS ESSENTIAL TO HUMAN HAPPINESS SPECIFIED, AND THE 



FIRST OF THEM DEVELOPED. 

 623 pages. Price, 



IV. EDUCATION : 



INTELLECTUAL, MORAL, AND PHYSICAL. 



283 pages. Price, $1.25 



V. CLASSIFICATION OF THE SCIENCES. 

 60 pages. Price, ... ..... $0.25 



VI. SPONTANEOUS GENERATION, &c. 

 16 pages. Price, . ... $0.25 



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