340 
ACADEMY oF SCIENCES a 
+’. LISBON, : 
HE feeretary of the Royal Academy 
of Sciences at L fo n, M> Fronciico 
de Borja Ga go Stotkle:, has publifhed 
Jatcly ‘ne fitit volume of his works, cen. 
fifting of eulo ies on various duti zuithed 
charaéters. A @a*’ which ds one on the 
celebrate’ M- d Alembert 5, with fome 
remarks on fl-xions, that appeat deferving 
of public attention, and reife tothe hig hett 
credif on the auchor: wt alfo contains a 
very interefing memoir on.the maritime 
diicoveries of the Portucuele in the fii- 
teenih century. 
SOCIETY For THE ENCOURAGE- 
M-NT oF ARTS, MANUFAC- 
TURES, &c. 
MPROVEMENTS in agriculure, in 
chemiitis, in manufactures, and in 
Mechanics, are ihe great objects for which 
this iociety was eltablifhed more than half 
acentury age; and in the purluits of thefe 
a nambder of, public-lpirited ind.viuals 
have, expended annually large fums of 
Money, in ependen ly of the ume and at- 
tention which they dc ftow in the advance- 
ment of the beit in eretis of their coustry 
and the wold. Among the various in- 
ven: ions and improvements :hat have lately 
rece'vei the janction and premiums of this 
difipterctied fociety, we fhali firit notice 
thole which are counecied with chemical 
proceffi's. Of theie is, 
1. Mr. Teomas VasxDERMAN’s in 
vention of cheap.anc curable paints made 
with Htheoi, tor which the inventor re- 
ceived tne fociety s filver medai and twen- 
ty guineas. This paint is taid te be fu- 
perior to ali others for. cheapaeis and du- 
rabity, eqicl to any in beauty, and not 
fubject to ob iter or peel off by ‘he fun. 
The mehod and expence of refining one 
ton oi nih-oil may be thus deicribed : 
ke Sue 
One.ton of fin oil, or 252 gailos36 oo 
3z galons of vnegar, at 2s 
per gallons ene i oa A 
12 lbs. htharge, at 5d. pe: lb;: "eo a5"0 
t2ibs. white copperas, at 6d. 
per tiy ond a. byt MY: BO 
12 gai on» of linfeed oil, at 4s. 
6d. pergailon - - - 2140 
2 gallons «° {pirits of turpen- 
fine. atSes,.-,) =” =. a Cee 
298 gallons cof - - £43 50 
Boer the oil taus prepared 1s wortit qo. 6d 
per gelion, or 671. 1s., leaving a profit of 
_ 23). 16s. on every ton of Qu. 
Proceedings of Learned Societies. 
[J uly 1, 
As a fpecimen of the paints defcribed 
by Mr. Vanderman, we copy the method 
and expence of preparing what he deno- 
minates fhe 
SUBDUED GREEN. 
Freth lime-water,6 2slions -. = 
°o. 03 
Road dirt, Ane fifted, 112 Tbs.. se. m6 
ate rralbs. ise Satan Ue 
ine black, solbs.',- = = = 0 26 
Wet blue, 2a (bays. Sor eee ai 
Reftdue of the ol, °3 wallons, at 
28, per gallon 4 = OEM tp 
Yellow ochre, in powder, 241b. 0 2.9 
| 
ae a 
The whole compofition will weign 363 1b., 
of courfe the expence is at a rate Jels chan 
ofe penny perlb.: but io render it fit for 
ule, toevery eight pounds add a quart 
of the imecorporated oil, and the fame 
quantity of linfeed oil, and it will be 
‘found a paint poflefled of every requifice 
quality of beanty, durabiliy, and cheap- 
nefs ; and in this {tate of preparation it 
does not exceed two-pence halfpenay per 
lb., whereas the coal tar of ‘he fame colour 
is fix- pence. 
Upon tne fame principles, lead colour 
may be made for lefs tha two-pence per 
lb, ‘a bright green for about three-pence 
farthing per ib. ; a /fome colour for two- 
pence per ib.; and a brown red for one 
penny per Ib. 3 
In an additional communication from 
Mir. V , we have areceipt for a conftant 
white, for the infide painting of houfes ; 
which, though not divetted- of fmell in 
the operation. will become dry im four 
hours, and ali he fimell gone in that time. 
The compofition of this paint is thus de- 
feribed ; : . 
To one gallon of fpuit of turpentine, 
add two pounds of fiankincenfe; let it 
fimmer over the fire until diflolved, Mrain | 
it. and betile at for ufe. To a gallon of 
the o:] add one quart of this, fhake them 
well together, and bottle it alfo. Let 
any quantity of whive-lead be ground with 
the ipirits of turpentine very fine, then 
adi a fuficient »ortion of the lait mixture 
toit, uniil iv is fit for layiog on. If in 
working it gr ws thick, vt muft be tbin- 
ned with foirss of turpentine.. It isa fiat 
ér dead white. 
Mrs. JANE RICHARDSON has chtained 
from this fuciety twenty guineas, 2s a 
premium fer the following defcripticn of 
the proce(s tor clearng feathers from thee ” 
animal oil: 
Take for every gallon of clear water, 
one pound of quick lime; mix trem well 
together, and when tre undifelved lime 
a3 
