GALLS, 
galls is dropt into a folution of this vitriol ve ae 
with water, the firft drops produce blueith or purplith 
clouds, which mingling with the liquor, eves ft are 
= ae own mg nee daehaogs colour, iftilled water, 
the mixture is always s blue ; 
a f the aa portion a alkaline falt be diffolved in the 
water, or if the Maid is in the leaft oy putrid, the co- 
Jour oa will be pur ai or reddi more of the 
aftringent infufion be added to the blue or esl me uaeiig 
they will deepen to a black, re ill be or lefs 
ten ee to the degree of dilution ; a ‘e ee ee 
may be fe parated from the liquors, unlefs they are of 
a fall blacknefe, by dilution with water and depofition. The 
bart Tony be retarded or sala as is done in _ 
preparation of 3 by adding fome mucilaginous matte 
aici aah 
bee 
n 
ag- 
it b a vie calcination 
ae ei is cy detrayed, 
GALL-nt nut, mM Chen ae f the 
—O 
nuts, two in particular are well known 
of. commerce, viz, the = and ae 
— variety of gall 
Caen: articles 
‘Ale 
0 gall-n nut. 
8 
: engaged the attention 
of ¢he oar We thall 5 ne ace i ule of their a 
with a defctiption of the gall-nut itfelf of each kind, 
tracted ange from Aikin’s Chem. Dictionary. 
Leeman isa round body of an olive 
7 and frequently « aver e {mall 
face.. When brok 
» ver brittle 
a xed hot i iron. it ears Blacks here vse ae 
Shi in aaa of a brown cream colour, or - pole of a 
bright chocolates it is infipid unlefs chewed, then a faint 
fweetifa flavour is. perceive whi¢ h has been separed to 
that. of a 
TE 
is c: a yel- 
jowilh colefr, not fo a nga the ‘Alep o. gall, nor 
poffefled of the fame refinous fase it is alfo 
Jarger, being about t e of a, nutmeg,’ lefs fos ep 
Fer our chemical knowledge of the © gall-nut, ‘we are prin« 
cipal indebted to. the Lions of Scheele, Deyeux, Seguin, 
‘Prouft, and Davy. Scheele Boer ie the — 
dontains. gallie acid; M. Deyeux, i. an abora 
. out s a. vari of r 
and found that. it entered iy the comp 
Mr. Prowl made | 
come: oe 
feveral cuxious. pas- pun 
ticulars on the mode of feparating the tannin from'the other 
ingredients of this fubftance, &c. ae ad Mr. antl grcatly 
Increafe : the Nadir 
e 
fubftance in queftion, and refer our readers for farther in- 
formation to the art NNIN. 
Pounded pall aes treated with water forma deep brown 
coloured infufion ; feveral portions of water are neceffary to 
seal 2 the foluble matter, and what r e 
water 
i 
ave a green co oun w hicks attri- 
buted . the pe — of gall = Tne is deftroyed by the 
ce ic uriatic aci changed into se by 
e sadiod or a ay drops of (lelies acid, count 
of the variable a ico of the fo sa matter in dierent 
g Baie there is fom se ie 
fi eft aod 
ted by frequent filtra 
fublides and ae the ‘afafon: ‘ranfpareot 
h 
infufion that can be may 
arts of the infu- 
gath ied wi 
earth employed, forming. a fer ‘rie me che 
the falid éompound ‘formed, or the fuper-aatant liquor 
of a green. ‘eolour, and the ee does not precipitate gel 
wr unlefs an excefs of. acid be prefent. The oxyd of 
- tin, wher boiled in the infafion, rénders the water 
Several neutral = occalien. a. precipitate, when. 
added 
