59 



very copiously in boiling alcohol, also in ether, benzol, chloroform, 

 scarcely in sulphide of carbon ; is converted by diluted acids into 

 sugar and a resin. 



Corksubstaiice = SuBEP IN. 



Cornill or Cornic Acid. Crystalline bitter substance of the 

 root and bark of Cornus florida, and probably also in that of other 

 species. The aqueous extract is repeatedly shaken with freshly 

 precipitated oxyd of lead ; filtered ; evaporated to honey- 

 consistence ; treated with absolute alcohol, and the tincture 

 evaporated. — Fine silky needle-like crystals of very bitter taste, 

 readily soluble in water and alcohol, slowly in ether, of slightly 

 acid reaction, not precipitable by alkalies, tannic acid, salts of ii'on 

 and baiyta, or neutral salts of lead; but precipitated by 

 subacetate of lead and nitrate of silver. 



Coi'tici-pino TaimiC Aci(l=:Cis H7 O7 . In the bark of aged 

 stems of Pinus sylvestris. Distribute the lead-salt obtained in the 

 preparation of Pinicorretin, in water, decompose with sulphui'et of 

 hydi'ogen, remove the sulphide of lead by filtration, and evaporate 

 in a current of carbonic acid gas. — Bright i-ed-powder, the aqueous 

 solution of which turns green with chloride of iron. 



Corydalin=:C46 H29 NO7 . Alkaloid of the tubers of Corydalis 

 tuberosa and C. fabacea. Exhaust with water acidulated with 

 hydrochloric acid, press, thi'ow down the liquid with carbonate of 

 soda, collect the deposit, wash, dry, and exhaust with water and 

 an admixture of hydrochloric acid, precipitate the filtered liquid 

 with carbonate of soda, collect, wash and dry the deposit, shake 

 with oil of turpentine, pour ofi" the oil containing the C, shake it 

 with water acidulated with hydrochloric acid, precipitate the 

 aqueous solution with carbonate of soda, collect, wash, and dry the 

 deposit. — White voluminous strongly adhering powder, without 

 smell or taste, very bitter when dissolved, assumes a citron-yellow 

 colour when exposed to the sunlight, fuses at 70° withoiit loss 

 of weight, and decomposes in higher temperatures; insoluble in 

 water, dissolves in nine parts of alcohol of 90% at ordinary 

 temperature, and in equal parts when boiling hot, in three parts 

 of ether, not in solutions of alkalies ; in concentrated nitric acid 

 with yellow colour, and with the same colom- in concentrated 

 sulphuric acid, but changing slowly into violet; is precipitable by 

 tannic acid, by the hydrates and carbonates of alkalies, the chlorides 

 of mercury, of gold, and of platinum. Yields amorphous resinous 

 salts. 



Cl'iltsiegill. Crystalline, bitter substance of the bark of the 

 branchlets of Crataegus Oxyacantha. Obtained by boiling with 

 water, treating the decoction wit-h cai^stic lime, &c. Crystallises 

 in warty masses similar to grape-sugar, is grey-white, tastes very 



