1825.) . 
be made still cheaper from sea-water— 
on the employment of which a duty is 
laid. Magnesia is made from salt brine, 
or sea-water. The English duties are 
so high, as to render it probable that 
both this and the preceding article will, 
in future, be obtained by Dr. Henry’s 
process. ; 
Crystallized sodais also made from 
common salt; and if it, or sea-water, 
could be obtained free of duty in Eng- 
land, if would supersede the importa- 
tion of American, or Russian pot and 
pearl-ashes, and 10,000 tons would be 
used annually : several hundred tons in 
washing alone. 
Barylla, of an excellent quality, is 
made from salt. 
In the manufacture of hard soap, salt 
is a necessary ingredient. 
Corrosive sublimate is always made 
from common salt. f 
Patent yellow is also prepared from 
common salt. 
In the fisheries, in salting provisions 
for the sea service and for exportation, 
salt is largely employed. . 
Butchers, morocco-dressers, and 
skinners, employ it in large quantities, 
Dr. Rensselaer has calculated that, 
in England, three times the present 
quantity would have been consumed if 
there had been no duty. 
. Farmers use great quantities in mak- 
ing butter and cheese, and for steeping 
wheat to prevent smut. 
In glazing earthenware, much salt is 
employed; and is far preferable to the 
Og same of lead, which are liable to 
e dissolved by vinegar—from whence 
deleterious consequences must, of neces- 
sity, occasionally result. In England, 
the manufacturers of earthen-ware 
sometimes pay one-twelfth of the real 
amount of their sales for salt. 
Salt is. likewise employed by iron- 
founders in metallic cement, and in 
rendering bar-iron malleable. 
—=z > 
For the Monthly Magazine. 
Description of @ Merpat, struck in 
" commemoration of the Bartre of 
Roszacu, during the Seven Years’ 
German Wan. 
pe RHAPS none of the military ope- 
rations of Frederick the Great of 
Prussia crowned him with somuchglory, 
or so redeemed him from thepressure of 
the combined strength of his enemies, as 
the battle of Rosbach ; from the low abyss 
of despondency and peril of his crown, it 
placed him, ‘at once, upon the pinnacle 
of success and triumphant fortune. I 
call your attention to this event, having 
Nestorian Progenitorship. 
327 
lately become possessed of a handsome 
brass medal, struck in commemoration 
of the great results of that day; and 
never having seen one before, I take the 
liberty of describing it for the informa- 
tion of your readers. It is much 
larger than a Spanish dollar, struck 
with a most powerful die on beautiful . 
clear brass. The obverse side repre 
sents Frederick mounted on his chargery 
@ la militaire, with his right arm dis- 
tended, holding a sword. The back- 
ground, on the right, gives a view of 
the fortified city of Rosbach—in the 
centre stands the encampment, and on 
the left some cavalry soldiers in full 
gallop —and a large cluster of trees 
which appear to be meant as firs. 
Round the circle of the medal is the fol- 
lowing inscription, in capitals :—FRE- 
DERIC, D.G.; BORVS, REX. PRO- 
TESTANTI, M, DEFENSOR; and 
underneath the king’s figure is written, 
in capitals likewise, LISSA, DEC. 5, 
On the inverse side is represented the 
concluding scene of battle, in which 
the retreating horse and foot of the 
enemy are being pursued, with appa- 
rently dreadful havoc, by the victorious 
Prussians. Frederick is again seen in 
a smaller figure in the foreground, on 
horseback, in an animated position, 
with his sword drawn, in pursuit at 
full gallop, amid mangled horses and 
men and military trophies, which lite~ 
rally choke up the foreground of the 
representation. On the inner circle, 
which is in part imperfect, from the 
hole by which the medal was suspend- 
ed having broken, the inscription, QUO 
NIHIL-US, MELIUSUE;; at the bot- 
tom, likewise in capitals, ROSBACH, 
NOV. 5, 1757. I know not how far 
this medal may be rare or otherwise ; 
it certainly commemorates an event, 
almost as interesting and decisive in 
its day, as the battles of Austerlitz, 
Marengo, Jena, or Waterloo, have been 
in ours. Enorrt. 
— 
To the Editor of the Monthly Magazine. 
Sir: 
N the recent Supplement to your 
59th vol. (p. 651), at the latter endof 
the very ingenious and valuable disqui- 
sition on the “ Contagion of the Plague,” 
I find it stated, as if fixing the utmost 
limits of such occurrences, that “ chil, 
dren are born when their parents ap- 
proach their fiftieth year; and Dr, J,,; 
seemsto consider it contrary to the law 
of nature and the dispensations of Provi- . 
dence, that parents should haye children 
after that age; for he goes on to say, 
