390 Hydrosulphurate of Iron.—Enamel.—Oil from Pumpkins. 
they ascended higher. M. Rienwardt had left Trogong at day-- 
break, and nearly reached the summit at 2 o’clock in the after- 
noor. The barometer stood then at 25°35 English inches, and the 
thermometer at 75° of Fahrenheit. He now hoped, with an- 
other effort, to reach the spot where the eruption took place; but 
was obliged to desist, and to leave this dangerous place, by the 
coming loose of a large mass of the upper heap of stones. The 
Goenoing-Goenloer is part of a chain of mountains, almost all 
situated in a direction north-east to south-west. The mountain 
of Agon to the N.E. is nearly of the same height as the volcano, 
which is near 3,100 English feet above Trogong, and 0,200 Eng- 
lish feet above the level of the sea. 
MEDICAL PROPERTIES OF HYDROSULPHURATE OF IRON. 
Professor Van Mons has discovered that the hydrosulphurate of 
iron, produced by iron, sulphur, and water, possesses when taken 
internally the property of making salivation instantly cease as, if 
by enchantment ; and when administered externally, of curing the 
worst of scabs and sores.—Journal de la Médecine de la Bel- 
gique. 
RECEIPT FOR MAKING THE PURPLE ENAMEL USED IN THE 
MOSAIC PICTURES OF ST. PETER’S, ROME.. 
One |b. sulphur, | do. saltpetre, | do. vitriol, 1 do. antimony, 
1 do. oxide of tin, 20 lbs. minium, oxide of lead 40 Ibs; all 
mixed together in a crucible and melted in a furnace: it is next 
to be taken out and washed to carry off the salts: afterwards melt 
it in the crucible, add 19 ozs. rose copper, 4 oz. prepared zaffre, 
12 oz. crocus martis made with sulphur, 3 oz. refined borax, 
and 1 lb. of a composition of gold, silver and mercury: when all 
are well combined, the mass is to be stirred with a copper rod, 
and the fire gradually diminished to prevent the metals from 
burning. The composition thus prepared is finally to be put into 
crucibles and placed ina reverberatory furnace, where they are 
to remain twenty-four hours. The same composition will answer 
for other colours, by merely changing the colouring matter. 
This composition has almost all the characters of real stone, and 
when broken exhibits a vitreous fracture. 
The above receipt was received from an Italian clergyman who has consi- 
derable chemical knowledge, and he had it from one of the persons em- 
Hie at ees I 
ployed in St. Peter's during his residence there at college. 
OLL FROM PUMPKINS. 
The seeds of pumpkins are commonly thrown away; but abun- 
dance of an excellent oil may be extracted from them. When 
peeled, they yield much more oil than an equal quantity of flax. 
This oil burns well; gives a lively light; lasts longer than ae 
oils, 
