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tinctured with the colouring and extractive part which the former 
had not completely dissolved, being already well saturated. 
9. I placed half an ounce of the powdered bark to burn in a cru- 
cible, and it yielded thirteen grains of greyish ashes well charged: 
with potash, which immediately manifested itself by pouring 
to a grain of the ashes, diluted sulphuric acid; a considerable 
effervescence was produced each time that the operation was re- 
peated.. From half an ounce of the ligneous part of the Star- 
reed, also burnt in a crucible, there resulted nine grains of ashes: 
less grey, but also charged with 0 ible: by the ef= — 
fervescence produced by 
10. In order to ascertain the quantities of pyroligmeous ‘cits 
and empyreumatic oil contained in the bark of the Star-reed, — 
I placed for distillation half an ounce of the powder in a small 
retort. There remained in the retort two drachms of carbon 
quite black; in the tubular receiver I found two scruples of 
empyreumatic oil, thick and of a black reddish colour; and: 
a drachm of pyroligneous acid of a pale colour, inclining to that 
oflioney. About the weight of a scruple escaped in the form 
of gas through the tube or the stopper of the receiver. Some. 
drops of the pyroligneous acid beimg placed in half an ounce - 
of blue tincture of flowers of mallows, the fluid immediately be- 
came red, as is the case with ‘sulphuric acid ; but the lively co- 
lour gradually faded into that of white wine. I repeated five 
_ times the addition of the tincture of mallows: to the liquor which 
had lost its red colonr, and each'time it again became red, with 
the difference of altering and losing colour more readily on the. 
Misia cone and: so PER eay in | the eeeeetiag ones, and: 
becoming darker. In wiiothiey glass I put an gual audi 
tity of the same tincture of flowers of. mallows, which having 
