1800, ] 
N. B. ‘The proprietors*of the above houfes 
deny the Waccine difeafe to ba a fpecifie for 
the Variola, but the interpretation is eafily 
developed, viz. becaufe the new inoculation 
will not fupply them with patients. 
I was treated with fome derifion the 
other (and am every) day: the perfon faid, 
that, as he had inoculated many for the 
Cow Pox, he knew the complaint and 
its treatment better than mytelf. 
Quere, Whether or not Fame with her 
babbling tongue (fome future time) may not 
convey ruftic Vaccine intelligence to fome 
metropolitan friends, and fo overturn your 
excellent inftitution, which I am informed 
(by the Medical Mifcellany) is on the 
tapis. Iam, &c. 
Winflow, Bucks. 
ae 
For the Monthly Magazine. 
Anatysus of all the permanently valuable 
Papers which have appeared in the 
JourRnaL DE Puysique, from its 
Commencement to the prefent Time ; con- 
tinued from our laft Magazine, page 38. 
J. TuRNER. 

On the Method of ExTractTinc the differ- 
ent kinds of TURPENTINE, GaLIPOT, 
CoLornony, &c. By M. Monenc- 
LANE. Tom. xxXi. 
HE Pine from which thefe fubftances 
are extraéted, is never fit for this 
operation till it be thirty years of age. 
‘The extraction is begun in February and 
continued to the end of O&tober.  Inci- 
fions are made with an hatchet, beginning 
at the foot of the tree on one fide, and 
rifing fucceflively: they are repeated once 
or twice a week, the fize about one fin- 
ger’s breadth acrofs, and three or four 
inches long. During the four years in 
which it is continued, the incifions have 
rifen to about eight or nine feet. Then 
the incifions are begun on the other fide, 
and during this time the old ones fill up, 
and may be again opened after {ome years, 
fo that a tree on a good foil, and well ma- 
naged, may yield turpentine for a century. 
At the bottom of tlie tree, under the inci- 
fion, a hole is dug in the ground to re- 
ceive the refin which flows from the tree. 
This refin is called terebinthine brut, is of 
a milky colour, and is that which flows 
during the three fummer months ; it re- 
quires further purification. 
The winter crop is called barras galipot, 
or white refin: it fticks to the bark of the 
tree, when the heat has not been ftrong 
enough to let it flow into the trough in 
the ground. It is scraped ef with iron 
. knives. 
Analyfis of Fournal de Phyfique. I45 
PURIFICATION OF THE TURPENTINE- 
This is’ done in two methods: that at 
Bayonne is to have a copper cauldron 
which will hold zoolb. of materials fixed 
over a fire, and the flame circulating at 
the bottom of the copper. The turpen- 
tine is put in, melted with a gentle heat, 
and when liquid it is ftrained through a 
ftraw-bafket made for the purpofe, and 
ftretched over a barrel, which receives the 
ftrained turpentine. This purification 
gives it a golden colour, and may be per- 
formed at all times of the year. 
The fecond. manner, which is prattifed 
only in the mcuntain of De Buch, near 
Bordeaux, confilts in having a large tub, 
feven or eight feet fquare, and pierced 
with fmall holes at the bottom, fet upon 
another tub to catch the liquor. 
expofed tothe hottett fun for the whole day, 
filled two-thirds with turpentine, which 
as it melts falls through the holes, and 
leaves the impurities behind. This pure 
turpentine is lefs golden-coloured, and is 
much more efteemed than the other. This 
procefs can only be done in the fummer. 
O1L OF TURPENTINE. (Huile efentielle 
de Terelinthine. ) 
An alembic, with a worm like what ig 
ufed by the diftillers, is employed here. 
It generally contains 25olb. of turpentine, 
which is boiled gently, and kept at the 
boiling point till no more oil paffes, when 
the fire is damped. ‘This generally gives 
6olb. of oil, and the operation lafts one 
day. 
RESIDUE OF THIS DISTILLATION. 
The boiling turpentine, when it will 
give no more oil, is tapped off from the {till 
and flows intoa tub, and from thence into 
a mold of fand, which it fills, and is fuf- 
fered to cool for at leaft two days without 
difturbing it. This refidue is known un- 
der the name of bray-fec, or colophony, 
colophonie. iis of a brown colour and 
very dry. It may be made clearer and 
nearer in colour to that of the refin, by 
adding hot water to it before it is tapped 
off the fill, and fill boiling and ftirring 
the water well with it, whichis done with 
a befom of wet ftraw; andit is then fold 
for rofin, but is little eReemed, as it cone 
tains no effential oil. 
PURIFICATION OF THE GALIPOT. 
This is purified in the fame manner ds- 
the turpentine, z. @. by liquefying ina cop- 
per boiler by a gentle heat, and filtering - 
through ftraw. As the effential oil is not 
diftilled from it afterwards, it remains 
cenftantly of a thick confftence, and then 
takes 
This is: 


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