65 



and lastly free the syriip-like liquid from any resin by frequently 

 shaking with ether. The aqueous liquid, separated from the 

 ether, consolidates soon afterwards to crystals of D. which have 

 to be washed and recrystallised in hot Avater. — Colourless, 

 rectangular prisms or needles of moderately bitter, afterwards 

 acerb taste, neutral; lose the water at 100° and become opaque; 

 fuse at 200° and decompose in higher temperatures; dissolve 

 little in cold, readily in hot water, a little more readily in cold 

 alcohol than in water, most readily in boiling alcohol, not in ether, 

 in the oxyds and carbonates of alkalies with gold-yellow colour ; 

 are decomposed when boiled with diluted acids, also by emulsin 

 and by yeast, into sugar and another crystalline product 

 (Daphnetin=C38 H14 Oig). 



Datisciu=:C42 H22 O24. Bitter glucosid in the hei'b and root 

 of Datisca cannabina. Exhaust the root with wood-spirit, 

 evaporate to syrup-consistence, throw down resinous substances 

 with hot water, evaporate the decanted liquid and let crystallise. 

 The impure D. is pressed, dissolved in alcohol, mixed with water, 

 filtered off fi'om the resin and obtained pure by evaporation. — 

 Colourless needle-like or laminate silky crystals, soft and trans- 

 parent like grape-sugar, neutral; fuses at 180° and is desti'oyed 

 afterwards while evolving an odour of burnt sugar, dissolves 

 little in cold, better in hot water, readily in alcohol, less so in 

 ether ; the solutions have a strongly bitter taste and neutral 

 reaction ; dissolves in alkalies with yellow colour, and is in these 

 solutions precipitated and discoloured by acids ; decomposes on 

 heating with diluted acids into sugar and Datiscetin^iCso Hio O12. 

 Is precipitable by tannic acid, acetate and subacetate of lead, by 

 the salts of oxyds of iron, of copper and zinc. 



Daturiii = Atropin. 



Delpllilliu^ C48 H35 ISTOi . Alkaloid of the seeds of Delphinium 

 Staphisagria. Mix the bruised seeds with water so as to form a 

 thin pulp, warm over the water-bath for several hours, strain, 

 remove the bulk of the fat by pressing, digest the remaining mass 

 with strong alcohol, jiress again, distil off the alcohol from the 

 tincture, treat the remaining oleo-resinous mass with water to 

 which some hydrochloric acid is admixed, precijiitate the filtered 

 liqiiid with anmionia, wash and dry the deposit and exhaust with 

 ether, which leaves impure staphisagrin as a brownish resin and 

 dissolves the D. without colour. The D. remains after evapo- 

 rating as a transparent, resinous, slightly-coloured mass. To 

 purify it completely, dissolve again in water and hydrochloric 

 acid, precipitate with ammonia, dissolve the dei:»osit in ether, and 

 leave to evaporate by itself. The pure precipitated D. is entirely 

 white; when obtained by evaporation from the ethereous solution, 

 it has an amoi'phous resinous appearance. It has a lasting acrid 



