Proteids. 



4000 General. 



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



9140). 

 4020 Vegetable. 

 Entries in these two groups shall be arranged alphabetically. 



Coloured Compounds. 



5000 General. 



5010 Coloured substances not dyestuffs. 



5020 Dyestuffs. 



These divisions shall be subdivided — 5010 into Il^'drocai'bous 

 (coloured), Alcohols (coloured). Ketones (coloured), &c. ; 5020 

 into Azo - dyes, Triphen3l methane - dyes, Antliiaceue - dyes, 

 Dyestuffs of vegetable origin. Unclassified dyes, kc, in each of 

 which subdivision entries shall be arranged alphabetically. 



5500 Operations in Organic Chemistry. 



Entries shall be made in this division under headings such as 

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

 acetylation, In^drolysis, &c., &c. 



Analytical Chemistry. 



6000 General. 



6100 Detection of elements. 



6150 „ compounds. 



. 6200 Estimation of elements 



6300 „ compounds. 



6400 Gas analysis. 



6500 Applied analysis. 

 All entries of a general character relating to apparatus, 

 methods, &c., «&c., shall be arranged in division 6000, under 

 appropriate headings. 



Division 6200 shall include all entries relating to tlie determi- 

 nation of individual elements in their compounds and in mixtures, 

 excluding determinations of atomic weight. The entries shall 

 be arranged in sections distinguished by the elementary symbols 

 used as registration symbols. 



Division 0300 shall include all entries i-elating to the deter- 

 mination of individual compounds — e.g., alkaloids, 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 Avhich they 

 belong. If necessary, gravimetric, volumetric, electrolytic, 

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

 g, V, &c. 



