uo 



acetic acid, precipitate the solution with acetate of lead, and 

 decompose the deposit, after washing and while still moist, with 

 snlphuret of hydrogen. The sulphide of lead, after washing, yields 

 up the dyeing matter to alcoholic acetic acid, impure Oenolin 

 remaining after evaporating, and which is freed from fat by 

 boiling with ether. — An almost black mass, yielding a beautiful 

 violet powder, or a red-brown one when dried at a temperature 

 of 100° to 120°; permanent at the air; intumesces in the heat and 

 becomes decomposed, is insoluble in water, yet dissolves in water 

 containing acetic or tartaric acid, likewise in wood spirit, not in 

 pure alcohol, but in alcohol containing even very little acetic acid, 

 with blue, with more acetic acid with red colour; not in ether, 

 benzol, chloroform, sulphide of carbon, volatile and fixed oils. 

 Acetate of lead occasions in the alcoholic solutions a purely blue 

 precipitate, niti'ate of lead a violet one, subacetate of lead blue 

 and a little brownish, siibsulphate of iron blue-violet, sulphate of 

 iron dark nut-brown, chloride of iron yellowish, acetate of copper 

 niit-broAvn, subchloride of tin violet-red, subnitrate of mercury a 

 precipitate of the colour of wine-yeast, nitrate of mercury light- 

 brown, nitrate of silver brown-red; alum causes no precipitate. 



Oil of Achillea Millefolium (milfoil). Obtained by distil- 

 lation with water. The oil of the flowers is dark-blue, of sub- 

 acid reaction and 0-92 sp. gi\ The oil of the herb is also blue 

 and of a deeper colour than oil of chamomile, thick and of almost 

 butter consistence when cold, of strong smell, tastes similar to the 

 herb, afterwards a little burning, has a density of 0-852-0-917. 

 The oil of the fruits is greenish. The oil of the root is colourless 

 or slightly yellowish, smells peculiar and disagreeable, somewhat 

 like valerian, has an unpleasant, but not penetrating or burning 

 taste, is lighter than water. 



[Oil of Achillea moschata (oil of iva). Obtained by distilling 

 the herb, before flowering, with water. — Clear yellowish liquid, 

 of a very pleasant, strongly ethereous odour, and bitter, warming 

 taste. Boils at 180° to 210°.] 



Oil of Achillea UObilis (showy milfoil). Obtained by aqueoiis 

 distillation of the herb, the flowers or the fruits. — Pale-yellow, 

 thick; of a veiy strong smell, similar, but more refined, than oil 

 of milfoil, and at the same time somewhat camphor-like; of an 

 aromatic, camphoraceous and somewhat bitter taste; of '97-98 

 density; dissolves readily in alcohol. 



Oil of Acorus Calamus (sweet flag). Obtained by distillation 

 with water from the rhizome, — Pale to dark yellow; of a strong 

 penetrating odour similar to the root, and of an aromatic bitter, 

 burning, slightly camphoraceous taste; of 0-89-98 density; dissolves 

 readily in alcohol; boils at 195°, after the more volatile part (pro- 

 bably a hydrocarbon isomeric with oil of turpentine) has passed over. 



