AND OBSERVATIONS ON LAC. 53 



ing, became of a bright pale red, but changed to purple, 

 when faturaled with a folution of carbonate of potafh. 



A flocculent precipitate was thus obtained, which poflefled 

 the characters of precipitated vegetable gluten combined with 

 fome of the colouring extract; this, when completely dried, 

 weighed 1 1 grains. 



E. There now remained 25 grains, which evidently con- The refidue was 



fitted of a fort of wax, mixed with (mall parts of twigs and wax and forei S n 



i r i n matter. 



other extraneous lubltances. 



A part of the wax was feparated by heat and preffure in 

 a piece of linen; and another portion was feparated by di- 

 geftion in olive oil* which alfumed the confiftency of an 

 unguent. 



The refiduum was then boiled with lixivium of potafh, and 

 became tinged with purple, in confequence of fome of the co- 

 louring extract which had not been diflbived by the preceding 

 operations. 



The undiffblved part, now confifting oniy of the extraneous 

 vegetable and other fubftances,, weighed 13 grains; fo that 

 the wax, with a fmall portion of the colouring extract, may 

 be eflimated at 12 grains. 



By the above procefs, 200 grains of flick lac afforded, Component parts 



Grs. of ftick lac. 



q > Colouring extract - - > - 20 



B. Refin - - - - - 136 



D. Vegetable gluten - - - 11 



y /Wax, with a little colouring extract, about - 12 



"" \ Extraneous fubflances - - 13 



Analyfis of Seed Lac. 



192. 



200 grains of very pure feed lac were fubjected to oper- Component parts 

 ions vei 

 afforded, 



ations very fimilar to thofe which have been defcribed, and ac 



Grs, 



Colouring extract 5 



Refin ----- 177 

 Vegetable gluten 4 



Wax - - 9 



195. 

 Analyfis 



