19UG.] 



Oil International Science. 



343 



loguing of the scientilic literature of the world both according to 

 the subjects and authors. Twenty-nine countries (counting the four 

 Australian Colonies separately) are actively participating in this work 

 by furnishing slips containing the entries wliich form the basis of the 

 catalogue. A still larger number of countries assist l)y subscribing 

 to the annual volumes. 



The subjects included in the catalogue are classified according to 

 seventeen branches of science, as follows : — 



(A) Mathematics ; (B) Mechanics ; (C) Physics ; (I)) Chemistry ; 



