International Catalogue of Scientific Literature. 



(D.) CHEMISTRY. 



0000 Philosophy. 



0010 History. Biography. 



0020 Periodicals. Reports of Institutions, Societies, 

 Congresses, etc. 



0030 General Treatises, Text Books, Dictionaries, Biblio- 

 graphies. Tables. 



0040 Addresses, Lectures. 



0050 Pedagogy. 



0060 Institutions, Collections, Economics. 



0070 Nomenclature. 



Chemistry (Specific) of the Elements. 



0100 General. 



All specifically chemical subject matter, and such other entries 

 as may be desirable, relating to the elements generally excepting 

 carbon, shall be arranged under this heading. In the case of 

 carbon, such entries as concern the element or those of its com- 

 pounds Avhich are not treated as derivatives of hydrocarbons 

 (cyanogen, &c.) shall alone be included under this heading. 



The elements shall be arranged alphabetically in the order of 

 their symbols, and numbered from 0110 onwards as follows, the 

 appropriate symbol being appended to each number : — 

 (d-9724) b 



