CHONOBRIN. 1039 



(page 1027.) and gelatin sugar. To separate these substances, 

 the alkaline solution is saturated with sulphuric acid, after 

 ammonia ceases to escape, evaporated to dryness, and the 

 mass boiled with alcohol which dissolves out the leucin and 

 gelatin-sugar. The alcohol being distilled off, the residue is 

 washed with small quantities of cold alcohol at a time, by which 

 the very soluble leucin is taken up. The residuary gelatin-sugar 

 rnay then be dissolved in a larger quantity of boiling alcohol, 

 and crystallizes by spontaneous evaporation. 



Gelatin-sugar or glycicoll, C 8 H 7 N 2 O 5 + 2HO, crystallizes in 

 pretty large rhomboidal prisms, is colourless, inodorous, and 

 very sweet. It fuses at 352, but undergoes decomposition; is 

 soluble in 4| parts of water, in 900 parts of spirits of wine, and 

 insoluble in ether. The solution is precipitated by no metallic 

 salt, nor by tannic acid. But glycicoll combines with oxide of 

 lead, when digested upon it, and then loses two atoms of water 

 (Mulder). 



According to a late analyses by Boussingault, who does not 

 appear, however, to have been aware of Mulder's analyses, the 

 composition of glycicoll is C 16 H 18 N 4 O 14 ; of its compound 

 with oxide of silver, C 16 H 15 N 4 O u +4 Ag O. (Ann. de Chim., 

 &c. 3 ser. p. 257). 



Glycicoll dissolves without decomposition, in hot nitric acid ; 

 it forms a combination with that acid, C 8 H 7 N 2 O 5 + 2NO 5 + 

 4 HO, which crystallizes in colourless prisms, and forms double 

 salts with bases. The composition of the double salt of lime, 

 which does not deliquesce in air, is CaO, C 8 H 7 N 2 O 5 -f 2 (CaO, 

 N0 5 ). 



CHONDRIN. 



This variety of gelatin is derived from the permanent cartila- 

 ges, such as those of the ribs, joints, wind pipe and nose, and 

 cartilaginous bones before ossification, from the cornea of the 

 eye, and also according to Miiller, from bones in a state of caries. 

 Chondrin is slowly dissolved out of these substances by boiling 

 water. 



The solution of this substance fixes on cooling, like that of 

 gelatin, and when it becomes dry, by evaporation, has the ap- 



