14 Experime7iis and Observations on Ijie. 



The residuum was then boiled with lixivium of potash, 

 and became tinged witli purple, in consequence of some 

 of the colouring extract which had not been dissolved hy 

 the preceding operations. 



l"hc undissolved part, now consisting only of the extra- 

 neous vegetable and other substances, weighed 1 3 grains ; 

 so that the wax, with a small portion of the colouring ex- 

 tract, niav be estimated at 12 grains. 



By the above process, 200 grains of stick lac afforded. 



Grains. 



^/ i Colouring extract - - | 20 



B. Resin - - . . 135 



D. Vegetable gluten - - - \\ 



J. ( Wax, with a little colouring extract, about 12 



"|_ Extraneous substances - - 13 



192. 

 Analysis of Seed Lac. 

 200 grains of vor\' pure seed lac were subjected to opera- 

 tions very similar to those which have been described, and 

 afforded, Grains. 



Colouring extract - - _ _ 3 



Resin - - - - _J77 

 Vegetable gluten . - - , 4 



AVax 9 



195. 

 Analysis of, Shell Lac. 



J^ . 300 grains of this substance were first treated with 

 boiling distilled water, as above-mentioned, and yielded 

 of extract only 2.50 grains. 



B. The 497-50 grains which remained, were then di- 

 gested with different portions of cold alcohol, until this 

 ceased to produce any effect ; the resin which was thus 

 i^eparatcd amounted to 403.50 grains. 



C. As the shell lac had not been reduced into powder, 

 but only into small fragments, these were become white 

 and elastic, and, when dry, were brittle, and of a pale 

 brown colour ; the v, hole then weighcd'94 grains. 



D. These 94 grains were digested in diluted murlatie 

 acid ; and the acid, being afterwards saturated with solu- 

 tion of carlv.Miate of potash, afforded a floceulent precipi- 

 tate (resembling that obtained from sokitions of vegetable 

 gluten), which, when dry, weighed 5 grains: 



E. Alcohol 



