D 



Carbohydrates; Glucosides; Resins. 



1800 General. {See a/.^o Q, I -iOO-lUO). 



1810 Monosaccharides. 



1820 Disaccharides. 



1830 Trisaccharides. 



1840 Carbohydrates other thau mono- di- and trisacchar 



ides. 



1850 Ghicosides. {See also Q 9135). 



1860 Resins. Unclassified neutral compounds. 



Compounds belonging- to divisions 1810, 1820, 1830, shall be 

 subdivided according" to the number of oxygen atoms they 

 contain, and whenever necessary further subdivided as in other 

 series. 



Compounds belonging to divisions 1840, 1850, and 1860, shall 

 be entered alphabetically. 



Mixed Cycloids. 



1900 General. 



1910 Cycloids containing oxygen. 

 1920 „ ,, sulphur (or Se or Te). 



1930 „ „ nitrogen (or P). 



1 94(1 „ „ [several elements besides carbon. 



1950 Unclassified cycloids. 



Cycloids other than hydrocarbons, formed by the interposition 

 of one or more polyad elements other than carbon, shall be 

 arranged in this group — e.g., pyrone, thiophen, pyridine, piperi- 

 dine, |»yrazole, uric acid, cyanuric acid, «fec. 



Each of the divisions shall be subdivided according to the 

 nmnber of polyad elements other than carbon present in the 

 compound. 



2000 Organo-metallic and allied Compounds. 



All compounds of hydrocai'bon radicles with elements other 

 than the halogens, oxygen, sulphur, selenium, and nitrogen, shall 

 be entered in this section in the alphabetical order of the 

 dominant elements. Undei- each element the order of 

 ari'angement shall be as in other series. 



Alkaloids. 

 3000 General. 



3010 Alkaloids derived from plants. {See also Q 9130). 

 3020 .. „ „ animals. {See also Q 8485\ 



Under 3ol() a list shall be given of vegeto-alkaloids, together 

 with the Latin names of the plants from which they have been 

 obtained, arranged in the al|)habetical order of the plant names. 



In 3010 and 3020 alkaloids shall be arianged alphabetically. 



