The International 

 Scientific Series. 



Each Book complete in One Vol. 

 Crown 8vo. cloth, 5s., unless 

 otherwise described. 



Edited by 



F. LEGGE. 



KEGAN PAUL, TRENCH, TRUBNER, 

 . . . AND CO., LTD. . 



DRYDEN HOUSE, GERRARD STREET, W. 



