534 Edward Livingston Youmans. 



lection has been made by Mr. Spencer for his own use, and 

 it will form the groundwork of the Principles of Sociology 

 upon which he has now entered, and the first part of which 

 is issued. 



Let us now recapitulate his labours in the order of their 

 accomplishment, so as to bring them into one view : 



Letters on the Proper Sphere of Government, ..... 1842 

 (Occupied several years as a Railroad Engineer.) 



Planned Social Statics, 1846 



Social Statics published, . 1850 



Theory of Population, \ 



The Development Hypothesis, I 1852 



Philosophy of Style, ) 



Over-Legislation, ^ 



The Universal Postulate, ) 



Manners and Fashion, 



The Genesis of Science, 



The Art of Education, 



Evolution first conceived as Universal, 



Principles of Psychology, 1855 



(Breakdown of eighteen months.) 



Progress, its Law and Cause, 

 Origin and Function of Music, 

 Transcendental Physiology, 

 Representative Government, 



State Tamperings with Money and Banks, 



Moral Education,- 



The Nebular Hypothesis, }- . 1858 



Archetype and Homologies of the Vertebrate Skeleton, 



Evolution first conceived as the basis of a system of Philosophy, 



The Laws of Organic Form, "^ 



Physical Education, 



What Knowledge is of most Worth, |* . . . 1859 



Illogical Geology, 



Prospectus of the System of Philosophy drawn up, 



