UNIVERSITY 

 EXTENSION MANUALS 



A NEW SERIES OF 

 USEFUL AND IMPORTANT BOOKS 



EDITED BY PROFESSOR WM. KNIGHT 



CHARLES SCRIBNER'S SONS, Publishers 



'"PHIS Series, to be published by John Murray in 

 * England and Charles Scribner's Sons in America, 

 is the 'outgrowth of the University Extension move- 

 ment, and is designed to supply the need so widely 

 felt of authorized books for study and reference both 

 by students and by the general public. 



The aim of these Manuals is to educate rather 

 than to inform. In their preparation, details will be 

 avoided except when they illustrate the working of 

 general laws and the development of principles ; while 

 the historical evolution of both the literary and 

 scientific subjects, as well as their philosophical sig- 

 nificance, will be kept in view. 



The remarkable success which has attended Uni- 

 versity Extension in England has been largely due to 

 the union of scientific with popular treatment, and of 

 simplicity with thoroughness. 



This movement, however, can only reach those 

 resident in the larger centres of population, while all 

 over the country there are thoughtful persons who 



