21 



it becomes deoxygenised, and iodine is set free. The neutral 

 solution of the chloride of A. gives a white precipitate with 

 caustic alkalies and the carbonates thereof, and with the iodide, 

 ferrocyanide and sulphocyanide of j^otassium, and with chloride of 

 mercury ; a yellowish white with bi-iodide of potassium ; a lemon- 

 yellow with picric acid; a sulphur-colour with ferrocyanide of 

 potassium; a dirty-yellow with phospho-molybdic acid; an ochre 

 yellow with chloride of gold; a pale greenish-yellow with chloride 

 of platinum, and a yellow or orange precipitate with nitrate of 

 palladium. 



Atlierosperma Tannic Aciil=C2o Hu O4. In the bark 



of Atherosperma moschatum. Precipitate the decoction of the 

 bark with acetate of lead, treat the precipitate with acetic acid, 

 precipitate the filtrate by ammonia, decompose the precipitate 

 under water by sulphuret of hydrogen, and evaporate the filtrate. 

 Yellow liquid of faintly acid and astringent taste ; greens ' the 

 salts of oxyd of iron. 



Atropin=C34 H23 NOe. In all parts of Atropa Belladonna, 

 Datui-a Stramonium, D. arborea, and very likely also in the other 

 species of this genus. Bruise the whole plant just when it begins 

 to blossom, under addition of a little water, press, boil the liquid, 

 strain, evaporate to syrup consistence, add soda-ley in excess, 

 shake, add twice its volume of alcohol of 90%, agitate repeatedly 

 for two days, leave to stand, decant the spirituous liquid, 

 acidify by sulphuric acid, distil off the alcohol, render the 

 remnant alkaline by soda-ley, shake with ether, decant the 

 ethereous liquid, distil off the ether, dissolve the remnant in 

 alcohol, filter and leave to evaporate slowly. When coloured 

 still, it has to be redissolved in alcohol and treated with animal 

 charcoal. Fine white needles without odour (when moist and 

 imperfectly pui-ified of a nauseous, somewhat tobacco-like smell), 

 of nauseous and lasting bitter taste; fuses at 92° without loss of 

 weight, decomposes in higher temperatures for the greater part 

 under emitting vapours of alkaline reaction, while a small part 

 sublimates unchanged; dissolves in 300 parts of cold and in 50 

 parts boiling water, in 8 parts cold and in equal parts boiling 

 alcohol, in 60 parts cold and in 40 parts boiling ether; the 

 alcoholic solution shows a decidedly alkaline reaction. Caustic 

 alkalies and the carbonates dissolve it also, but decompose it on 

 heating. Dissolves easily in chloroform, oils, glycerin and 

 diluted acids. Concentrated nitric acid effects a pale-yellow 

 solution, which becomes of an orange-yellow colour on heating. 

 Concentrated sulphuric acid dissolves it without colour, but 

 becomes bro^vn on heating while emitting an odour of orange and 

 sloe flowers. 



