358 ANNUAL REGISTER, 1758.
frequently turned, while they re- pulverife the roots properly. Tl-e
main in this flove, and the fires flampers may be fo contrived as to
inuft be properly regulated, and a be worked by water where there
fuiRcient quantity of frefhair blown is conveniency, or perhaps by wind;
through the kiln, which will drive but if it is done by horfes, as in
out the foul air, occafioned by the Holland, there need not be fo great
perfpiration of the roots, which an apparatus, for no doubt many
will be found very ufeful in preferv- of our mechanics, when they fee the
ing their colour. If fome trials Dutch plans, can make great im-
are made by fixing a good thermo- provements to them."
meter in the room, the neceffary Mr. Millar, at the clo.^e of his
lie;at may be better afcertained than performance, anfwers fuch objec-
can be done any other way, but tions as have been made againft re-
this will require to be greater at trieving the cultivation of madder
fome times than at others, accord- in England, and gives a fiiort ab-
ing as the roots are more or lef-; fuc- ftrad of the two ads mentioned
culent, or the v.eather more or lefs above; and we hope, for the ho-
cold or damp, but it will always be nour and intereft of this country, a
better to have the heat rather lefs fpirit of emulation will be exerted
than over hot, for though the roots to recover fo valuable a branch of
TT.ay require a longer time to dry agriculture.
with a flow heat, yet the colour
will be better.
When the roots are properly Thejirangtej^eclsoffomeeffewefcent
dried in this ftove, they mult be carried to the pounding - houfe, where they muft be reduced to powder; but whether it is necef- fary to feparate the kraps from the gemeens, a- is now praclifed by the Dutch, the confumers of mad- der will bd better judges than my- felf.
The expence in erefting of the pounding- houfes in Holland is very
mixtures. In a letter from Dr. James Moufjey, Phyjician of the PruJJian army, and F. R. S. (a Mr. Hmry 1-Jaker, F. R.. S. Com' KiunicateJ by Mr. Baker.
From the Philofophical TranfaQions,
Mofcoiv, Sept. 20, 1756.
R. Butler, a paper-ftainer, trying to make lome difco- great, fo need not be built here, verics for the belter fixing of co- for any common building will lours, was put in great danger of fervp for this purpofe, where there his life by the following experi- is room to fix up the apparatus for nients.^
pngnding the roots : the blocks for Having put into one gallipot a this purpofe fliould be like thofe quarter of an ounce of verdegris, ufed in Holland, as Ihculd alfo be and into another pot two leaves of the llampep, which are bound falfe gold-leaf, to each he poured
round at bottom with thick iron bands, framed like che points of a ftar ; for if the farface of the dam- pers are fmooth and even, the madder will adhere to ihem fo
about a fpoonful of aqua-fortis. They began iir.meciiately to fer- ment, efpecialiy the gold-leaf. He was very afiiduous in Itirring them, to make the folution perfedl. Hav-
ilpfely, as to render it iropoffible to ing nothing die at hand, he did
this
