6a 
ry at Paris, there is to be feen a defign, 
which fhews, that, in the time of that 
Jearned man, there ftill exifted one of the 
handles of the vafe, that there remained 
only a fmall end of the other, and that its 
upper part was damaged. In the time of 
Francis I. thefe defeéts were covered by 
ornaments in gold, enriched with precious 
ftones.' The famous Vafe of Mantua un- 
derwent exactly the fame fate’ in 1753. 
The French one, deprived of thofe foreign 
ornaments, was fold at a very moderate 
rice. Some time after, chance made it 
fal] into the hands of the engraver Gay, 
who communicated his difcevery to the 
Comte De Car us, and this laf having 
caufed it to be defigned on four fides, in- 
feried itin the fecond volume of his An- 
tiquities. A fubfequent poffeffor has 
taken away the flighteft traces of the han- 
dles, and has fubftituted new pieces to the 
upper part, and to the foot, which were 
prcbably both damaged’; thefe pieces, al- 
thcugh they have a little altered the an- 
cient proportions, fuch as they are known 
by the defigns of Peirefc, and of the 
Comte de Caylus, have not, however, at 
all difparaged the merit of the body of the 
vafe. The defign given by Caylus is in- 
exact. M. Koehler has publifhed a new 
one, and he has given a fummary explica- 
tion of it. He moreover propofes to de- 
velope the different parts in a work on 
which he has been for fome time paft em- 
ployed. i 
The conftru&tion of furnaces capable of 
confuming their own fmoke has long em- 
ployed the attention of able artifts, bute 
all] their endeavours had been fruftrated, 
either by the troublefome complication of 
apparatus, or the imperfect attainment of 
the object propofed: this great defidera- 
tui1is, however, at length fupplied, by 
an_ invention of Mefirs. RoBERTsons of 
Glafgow, which, for fimplicity and effica- 
cy, is truly admirable. ‘The opening 
into the furnace, inftead of being clofed 
by a door, confifts of a four-fided funnel 
or hopper, which is kept filled with coals, 
and, in proportion as the fuel is confumed 
in the furnaces a frefh fupply is con- 
fiantly defcending the hopper. Thus 
the firft conbuftion, or that which dif- 
engages the principal part of the fmoke 
and flame, takes place near the mouth of 
the furnace, and a con&derable proportion 
Literary and Philophical Intelligence. 
[Feb. 1, 
of the fmoke, without any other contri- 
vance, would be confumed by paffing over 
the red hot fuel in the further part of the 
furnace ; as, however, the complete com- 
buftion of the fmoke cannct take. place 
without a further mixture of atmofpherie 
air; this is provided for by the introduc- 
tion of a caft-iron plate about three-quar- 
ters of an’ inch above the top of the hop- 
per, between whichis thus formed a flit 
of the above-mentioned depth, and equal 
in breadth to the front of the furnace, 
through which a conftant current of air 
defcends, and mixes with the fmoke. This 
aperture may be enlarged or diminifhed, 
by elevating or depreffing the iron plate, 
by means of a pin; and, by adapting the 
fupply of air, to the quantity of fmoke 
produced, the whole is completely burned 
before it has time to enter the chimney. . 
An ore of titanium, lately received 
from Botany Bay, has been analyfed by 
Mr. CHENEVIX: it bears a confiderahle 
refemblance to the menachanite of Corn- 
wall, and confiftsof Silex ~ Pee ee 
Oxyd of iron 49 
Ox. of titanium 40 
100 
The mineral waters of Plombiéres have 
long been remarkable for containing in 
perfect folution a fubftance, which by 
fome chemilts has been called bituminous, 
and by others has been fuppofed of animal 
or vegetable origin, the diftinguifhing cha 
raéter of which was to communicate to 
the water after ftanding a few days, a 
putrefeent odour not unlike that of ful- 
phurate hydrogen. From.a late accurate 
analyfis of this water by VAUQUELIN, it 
appears to contain in each pint, 
14 grain fulphurated foda. 
Muriated foda, 
— Silex. 
—-— Carbonated lime. 
—— Carbonated foda.: 
_Animal matter. - 
‘L Dj cof 
t= eotea 
sh Cok 
HOt 
This animal matter has a great refem- 
blance to albumen, and is held in folution 
by the foda, which is not fully carbonated; 
on the addition of an acid fufficient to fa- 
turate the alkali, an immediate flocculent 
precipitate falls down, which is the ani-. 
mal matter. 
MONTHLY 
- 
