1800. } National Infiitute, 
oxide, whichis foluble in acetous acid. If 
upon red-hot copper about a third of the 
weight of fulphur be poured, it forms a 
friable fulphurat of copper; this expofed 
to a violent heat for four or five hours, 
leaves a grey powder ealily foluble in ace- 
tous acid, and cryltallizable. 
| Method of esas CHEESE ia theLodefan, 
commonly called Parmefan ved An- 
wales de Chimie. 
The fize of thefe cheefes varies from 60 
to 380 Ib. depending confiderably on the 
number of cows in each dairy. 
During the heat of fummer cheefe is 
made every day, but in the cooler months 
milk will keep longer, and cheefe is made 
every other day. The fummer cheefe,which 
is the beft, is made of the evening milk, af- 
ter having been fkimmed in the morning 
and at noon; mixed with the morning 
milk after having been fkimmed at noon, 
Both kinds of milk are poured together 
into a copper cauldron, capable of holding 
about 130 gallons, of the thape of an, in- 
verted bell, and fufpended on the arm of a 
lever, fo as to be- moved off and on the 
fire at pleafure. In this cauldron the milk 
is gradually heated to the temperature of 
about 120 degrees; it is now removed from 
the fire,and kept quiet for five’or ixrainutes. 
When all mternal motion has ceafed, the 
rennet is added’; this fubftance is compot- 
ed of the ftomach of a calf, fermented to- 
gether with wheaten eal and falt; and 
the method of ufing it is to tie a piece of 
ina rag, and fteep 
the hze of a hazle nut 
4th of faa. 3799, 
TAT 
it in the milk, f{queezing it from time to 
time. Ina fhort time a fuMicient quanti- 
ty of rennet paffes through the rag into the - 
milk, which 1s now to be well Rirred, and 
afterwards left at reft to coagulate. 
In about an hour the coagulation is 
complete, and then the milk is again put 
over the fire, and raifed to a temperature 
of about. 145 degrees. During all the 
time it is heating, the mafs is brifkly agi~ 
tated till the curd tee in {mall lumps 5 ; 
part of the whey is then taken out, anda 
few pinches of faffron are added to the re- 
mainder in order to colour it. When the 
curd is thus broken fufficiently fmall, near- 
ly the whole of the whey is taken out, and 
two pails-full of cold water are poured ing; 
the temperature is thus lowered, fo as to 
enable the dairy-man to collect the curd 
by paffing a cloth beneath it, and gathering 
it up at the corners: the curd. is now 
prefied into a frame of wood, like a bufhel 
without a bottom, placed on a folid table, 
and covered by a round piece of wood viele 
a great ftone at the ftop. In the courfe of 
the night it cools, affumes a firm confift- 
ence, and parts with the whey: the next 
day one fide is rubbed with falt, and the 
fucceediag day tke cheefe is turned, and 
‘the other fide rubbed in the fame manner z 
this alternate falting of each fide is prac- 
tifed for about forty days. After this 
period, the outer cruft of the cheefe is 
pared off, the frefth furface is varnifhed 
with linfeed cil, the convex fide is coloured ~ 
red, and ‘the cheefe is fit for fale. 

ProcEEDINGS at large of the NATIONAL INs STITUTE of France, on ie 
g a 
4th of January, 1799, as publifhed by the Secretaries, 
{Continued from p. 713,V0% VIL. and to be reg 
larly continued in our future Numbers.) 
~~ ee 
@N THE MATHEMATICAL: SCIENCES, 
as taken down, by C. LEFEVRE Gl- 
NBAU, 
en) ZEN Duc-La-CHAPELLE, af- 
‘Ky fociated member, communicated to. 
* the clals of Mathematical Sciences and Na- 
‘tuttal Philofophy a fucceffion of obferva-_ 
tions, made during many months, from 
which it appeared, that the barometer is 
almoft always in an afcending ftate about 
half after fegen in the morning, and at ten 
is the evening ; and ina delcending one at 
‘noon, and at half an hour after midnight. 
This phenomenon tends to thew a prefiure 
in the atmofphere which hitatrto has ne~ 
‘ \ 
ver been noticed. Fr another memoir he 
explained the caufe of the phenomenon 
known by aftronomers under the name of 
irradiation. 
Citizen Messi ER communicated the ob- 
fervations he had been able to make upon: 
-the comet feen for the firft time from the 
obfervatory, by C. Bouvard,.the 26th of 
Frimaire (the 6th of December) at half 
after fix in theevening. This comet was 
very faint and difficult to be difcerned, and 
was to be feen only for a few days. 
The minifter of the interior, after repre- 
fenting that fuvial navigation (he did not 
difinguith that by natural rivers from, the 
fame 

——— 
Lares oa tT 
—. 
ee 

