108 FI2CED OIL, ETC. 



an alkaline aqueous solution also gradually assumes a red tinge. 

 It is decomposed by fusion with potash, yielding, amoiigst other 

 substances, butyric acid (the same is the case with filicih). 



Euphorbon^ is likewise soluble in petroleum spirit, and freely 

 so in ether, benzene, chloroforin, aicetone, and glaciaJ acetic acid, 

 but not in aqueous alkalies! It dissolves in concentrated sulphuric 

 acid, with the production of a brownish tinge, which is changed 

 to violet by nitre or nitric acid. It melts at 113° to 114", and 

 resembles, in many of its properties, lactucon or lactucerin (various 

 species of Lactuca), echicerin (dita bark), and perhaps also cynan- 

 chocerin (Cynanchum vincetoxicum and acutum), 



Hel'enin is easily soluble in petroleum spirit, alcohol, and ether, 

 but insoluble in water, even in the presence of a little alkali ; it is 

 dissolved, however, by hot concentrated solution of. potash. 

 Helenin melts at 110°, crystallizes in colourless needles, and dis- 

 solves in cone, sulphuric acid, with production of a red colouration. 

 Hydrochloric acid-gas is also said to colour helenin red.* 



CouTnarin may be recognised by its odour and by its colourless 

 rhombic crystals. It is sparingly soluble in cold, more easily in 

 hot water, and is also dissolved by ether and by alcohol. Amongst 

 the substances it yields when fused, with potash is salicylic acid 

 (§ 26). For the allied nielUoiic add compare Zwenger.^ 



Styrol also is characterized by its aromatic odour. It is a colour- 

 less liquid convertible by long heating in sealed tubes into solid 

 metastyrol. It is almost insoluble in water, but easily soluble in 

 alcohol, ether, and bisulphide of carbon. Heated with chromic 

 acid it yields benzoic acid and other products of decomposition 

 (§26). 



For myroxocdrpin, see Stenhouse and Scharling;* for diosmin, 

 Landerer"^ and Fluckiger ;* for Mmpferid, Brandes and Jahns ;' 

 for asaron (which is soluble at least in warm petroleum spirit); 



'Hesse, Annal. d. Chem. und P.harm. clxxx. 352; clxxxii. 163, 1876; 

 excii, 193, ] 878 (Amer. Joum. Phann. 1, 562). See also Albert! and Bragen- 

 dorff, Pharra. Zeitschr. f. Husslaml, ii. ,215, 1863 ; and J'lUckig'er, N. Jahrb. 

 f. Pharm. xxix. 135, 1868. 



'See Kallen, Ber. <J. d. chem. Ges. vi. 1506, 1873 (Pharm. Journ. and 

 Trans. [3], vU. 156). 



' Annal. d. Chem. und Pharm. Suppl. v. 100,. 1867, 



* Ibid. Ixxvii. 306, 1851, and xovii. 69, 1856 (Amer. Journ. Pharra. xxiii. 144). 



" Repert. f . Pharm. Ixxxiv. 62. 



« Ibid, xxiii. (New Series), 102, 1874 (Ainer. Journ. Pharm. xlvi. 235). 



' Archiv d. Pharm. Iviii. 52 % Ber. d. d. chem. Ges. xiv. 2385. 



