Proteids. 



4000 General. 



4010 Auiiml proteids. (See also Q 1100-1190, 8330, 8440, 



9140). 

 4020 Vegetable. 

 Entries in these two groups siiall be arranged alphabetically. 



Coloured Compounds. 



5000 General. 



5010 Coloured substances not dyestuffs. 



5020 Dyestuffs. 

 These divisions shall be subdivided— 5010 into Hydrocarbons 

 (coloured), Alcohols (coloui-ed), Ketones (coloured), &c. ; 5020 

 into Azo - dyes, Triphenyb.nethane - dyes, Anthracene - dyes, 

 Dyestuffs of vegetable origin, Unclassified dyes, &c., in each of 

 wliich subdivision entries shall be arranged alphabeticall3\ 



5500 Operations in Organic Chemistry. 



Entries shall be made in this division under headings such as 

 dissolution and solvents, distillation, &c., oxidation, nitration, 

 acetylation, hydrolysis, &c., &c. 



Analytical Chemistry. 



GOOO (k'neral. 



(5100 Detection of elements. 



(5150 „ compounds. 



6200 Estimation of elements 



0300 „ compounds. 



6400 Gas analysis. 



0500 Applied analysis. 

 All entries of a general character relating to apparatus, 

 methods, &c., &c., shall be arranged in division GOOO, under 

 appropriate headings. 



Division 0200 shall include all entries relating to the determi- 

 nation of indivi(lual elements in their compounds and in mixtures, 

 excluding determinations of atomic weight. The entries j^hall 

 be arranged in sections distinguished by the elementary symbols 

 used as registration symbols. 



Division 0300 shall include all entries relating to the deter- 

 mination of individual compounds — e.f/., all<aloids, carbohydrates, 

 &c., including that of compound radicles such as acetyl in 

 acetates, methyl in ethers, &c., but excluding gases. The 

 entries shall be arranged in sections distinguished by the 

 elementary symbols of the dominant elements in the compounds 

 used as registration symbols, or in the case of organic com- 

 pounds by the registration symbols of the groups to which they 

 belong. If necessary, gravimetric, volumetric, electrolytic, 

 physical, &c., methods may be distinguished by letters, such as 

 g, V, &c. 



