[ 4 11 ] 
Clerkenwell, May 5, 1767* 
S I R, 
I T O O K twelve ounces troy of the Corallina 
Officinalis .(which you fent me) picked clean 
from every extraneous fubftance, and put it into a clean 
ftone-coated retort ; the retort was fet in a reverbe- 
ratory furnace, and an adopter and quilled receiver 
luted to it : the fire was very gentle for the firft 
eight hours ; in which time, half an ounce and 
eighteen grains of a tranfparent and almoft colourlefs 
liquor came over, which was fet afide for examina- 
tion. The fire was then increafed, and in fix hours 
time there were diffilled two drams and three grains 
of a turbid liquor, which had fome appearance of 
oilinefs on its furface ; this was likewife fet a-partto 
be examined. The fire was then increafed for fix 
hours longer, and during the laft two hours the re- 
tort was quite red hot all over, which ended the- 
diffillation. In this third and laft procefs the portion 
of liquor that came over was more turbid than the 
fecond, and fome of it from the redundancy of its 
volatile alkaly was cryftallized ; it alfo contained ra- 
ther more than a dram of light empyreumatic oil., 
very much refembling the fmell of hartlhorn ; in the 
recipient there was alfo fome cryftals of a volatile 
alkali. The whole of this laft product weighed 
three drams and an half. The caput mortuurn was 
quite black, and weighed ten ounces, one dram, and-: 
one fcruple; fo that there was a lols of four drams 
and forty-nine grains out of the twelve ounces of 
Coralline. 
The 
