23S ON BLUE WOLFSBANE. 



XIV. 



Process for making a fine "Lake *. 



Pinw lake A German chemist, whose name is not mentioned, has 

 published the following process for making a beautiful 

 lake. 



by precipitat- Take any quantity of cochineal, on which pour twice its' 



in 5 cochineal ight of a i cono ] and as much distilled water. Infuse for 



with soiuuoa to 



•f tin. some days near a gentle fire, and then filter. To the fil- 



tered liquor add a few drops of solution of tin, and a fine 

 red precipitate will be formed. Continue to add a little so- 

 lution of tin every two hours, till the whole of the colouring 

 matter is precipitated. Lastly, edulcorate the precipitate 

 by washing it in a large quantity of distilled water,- and there 

 dry it. 



XIV r . 



On the Blue Wolfsbane, hj Philip Antony SxjeinacbehA 



Ti 



£<?r,coi!^.U!U 



Blue wolfsbane j_ RE fregh ](?aves of b]ue wo ] fs j-, ane eron i tum vcpellus* 

 contains, green . . . ' 



/ecula, cultivated in a garden near Paris, being treated with a suf- 



ficient quantity of water at 45° [liS" F.j, g>een ftcuia vvas 

 coagulated. 

 *g a? » The liquor separated from this fecula retained a peculiar 



herbaceous smell, analogous to that of the leaves of scurvy 

 grass after the greater part of their pungency is destroyed 1 

 by exposure to the open air. The progress of evaporation 

 an earthy mat- entirely dissipated it. Toward the end a matter of a gra- 

 nular form was separated. After this was washed and dried, 

 a portion subjected to the action of the blowpipe on pla- 

 tina was not melted by the interior flame, but became 

 whitish, without swelling or decrepitating, 

 carbonate Another portion put into weak sulphuic acid produced 



and phosphate a pretty long effervescence. The evaporation of the fluid 

 • ume,\ afforded acidulous crystals in the form of soft needles, 



which were decomposed by nitrate of lead. The precipi- 

 tate, heated red hot by the blowpipe on a piece of charcoal, 



* Sonnmi's liiblotheque pliysico ^conomicjiiffj for 1SC3, vol. I, p. £52. 

 ^ Journal oe Ehyswtfie, vol LXV1, p. 2ii4, ■ 



was 



