Proteids. 



4000 General. 



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



9140). 

 4020 Vegetable. 

 Entries iu the.se two groups shall be arranged alphabetically. 



Coloured Compounds. 



5000 General. 



5010 Coloured substances not dyestuffs. 



5020 Dyestuffs. 



These divisions shall be subdivided — 5010 into Ilj'drocarbous 

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

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

 Dyestuffs of vegetable origin, Unclas-sified dyes, &c., in each of 

 which subdivision entries shall be arranged alphabetically. 



5500 Operations in Organic Chemistry. 



Entries .shall be made in this divi.sion under headings such a.-^ 

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

 acetylation, hydrolysis,' &c., &c. 



Analytical Chemistry. 



6000 General. 



6100 Detection of elements. 



6150 „ compounds. 



6200 Estimation of elements 



6300 „ compounds. 



6400 Gas analj'sis. 



6500 Applied analysis. 

 All entries of a general character relating to apparatus, 

 methods, &c., &c., sliall be arranged in division 6000, under 

 appropriate headings. 



Division 6200 shall include all entries relating to the 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 6300 shall include all entries relating 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. Tlie 

 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 b}^ 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. 



