4 The International Scientific Scries. (Continued.) 



XXXV. VOLCANOES: What they Are and what they Teach. By 

 JOHN W. JUDD, F. K. S., Professor of Geology in the Eoyal 

 School of Mines. With 96 Illustrations. ^.00. 



XXXVI. SUICIDE: An Essay in Comparative Moral Statistics. By 

 HENRY MORSELLI, M. D., Professor of Psychological Medi- 

 cine, Eoyal University, Turin. $1.75. 



XXXVII. THE FORMATION OF VEGETABLE MOULD, THROUGH 

 THE ACTION OF WORMS. With Observations on their 

 Habits. By CHARLES DARWIN, LL. D., F. R. S., author of 

 "On the Origin of Species," etc., etc. With Illustrations. 

 $1.50. 



XXXVHI. THE CONCEPTS AND THEORIES OF MODERN PHYS- 

 ICS. By J. B. STALLO. $1.75. 



XXXIX. THE BRAIN AND ITS FUNCTIONS. By J. Lrrs. $1.50. 



