228 



XailthOXylill^Cio H24 Oic. Forms in the volatile oil (xantli- 

 oxylen), obtained by distillation with water, from Xantlioxylum 

 piperitum, and remains, after tlie oil has been freed from xanth- 

 oxylen by distillation at 1 30°. May also be obtained by evaporating 

 the alcoholic tinctui-e, and by freeing the crystals from resin Ijy 

 washing with liquor of ammonia. — Large, colourless, silky, klino- 

 rhombic crystals, neutral, smells faintly like steai-in; tastes ai'omatic, 

 fuses at 80°, volatilises in hig-her temperatures undecomposed ; 

 dissolves not in water, readily in alcohol and in ether. 



XylOChloriC Acid = 030 H26 O24. Green pigment of decaying 

 wood, especially that of beech. Treat with diluted liquor of 

 ammonia, precipitate the green solution with hydrochloi'ic acid, 

 wash and dry the deposit. — Dai"k-green, friable mass, tasteless, 

 not fusible, insoluble in water, alcohol, ether, diluted acids, becomes 

 carbonised with concentrated sulphuric acid; is readily soluble in 

 liquor of ammonia, the solution being of deep olive-green colour, 

 and of neutral reaction, after the excess of ammonia has been 

 driven of!', yielding by spontaneous evaporation a green residue 

 soluble completely in water. This aqueous solution is precipi- 

 tated by chloiide of iron and by acetate of lead dirty gi'een, by 

 ■sulphate of copper, and by subnitrate of mercury olive-green. 



Xylosteill. Bitter substance obtained from the berries of 

 Lonicera Xylosteum. Boil the berries with water, precipitate the 

 decoction with acetate of lead, remove excess of lead from the 

 filtrate by sulphuret of hych-ogen, evaporate to a syrup consistence, 

 shake repeatedly with ether and evaporate the latter. — Crystallises 

 in long, colourless needles or prisms, is inodorous, neutral, non- 

 nitrogenised, of a slightly bitter taste; fuses at 100°, gives out a 

 crystalline sublimate in higher temperatm-es under carbonisation; 

 dissolves spai-ingly in cold, readily in boilmg water, most i-eadily 

 in alcohol and in ether ; is jjrecipitable by subacetate of lead, yields 

 with diluted acids, sugar, and other pi'oducts. 



