[a | 
4thly, The green matter being put into the vitriolic marine 
and nitrous acids communicated a brownifh tinge to the two 
former, and a greenifh to the latter, but did not feem in the leaft 
diminifhed. 
Hence it appears that the matter extrated by alkalies from 
linen yarn is a peculiar fort of refi, different from pure refins 
only by its infolubility in effential oils, and in this refpec& 
refembling lacks. I now proceeded to examine the power of 
the different alkalies on this fubftance: 8 grains of it being 
digefted in a folution of cryftallized mineral alkali faturated 
in the temperature of 60°, inftantly communicated to the folution 
a dark brown colour; two meafures (each of which would contain 
eleven penny weights of water) did not intirely diffolve this 
fubftance. Two meafures of the mild vegetable alkali diffolved 
the whole. | 
One meafure of cauftic mineral alkali, whofe fpecific gravity 
was 1,053, diffolved nearly the whole, leaving only a white 
refiduum. 
One meafure of cauftic vegetable alkali, whofe fpecific gravity 
was 1,039, diffolved the whole. 
One meafure of liver of fulphur, whofe fpecific gravity was 
1,170, diffolved the whole. 
One meafure of cauftic volatile alkali diffolved alfo a portion of 
this matter. 
THOUGH 
