266 Scientific Intelligence. 
froze in four minutes. I could not succeed in freezing the same 
amount in the sooted watch-glass. / ii 
By placing corks, prepared as above, over a saucer of sulphuric acid, 
the same results are obtained more rapidly. I put half a drachm of 
water, at 65° Fahr., in each cavity, and exhausted the receiver till the 
mercurial gauge reached 34; of an inch, which was effected in one 
minute. Ina minute and a half, the water on one cork began to freeze, 
and in five minutes they were all frozen. An ounce of water, ina 
large flat cavity, froze in 34 minutes. 
- A flat-bottom porcelain capsule was prepared for an experiment on 
a large scale, by sooting it in the following manner. After coating it 
with soot over a lamp, and allowing it to cool a little, a small quantity 
of oil of turpentine was carefully poured upon the edge and passed 
over the entire surface ; the vessel was then warmed to drive off the 
redundant turpentine. ‘The surface was again coated with soot, and 
again with turpentine, and this process was repeated a third time; final- 
ly, another coating of soot was added, when it was ready for use. 
Two ounces of water were placed in this capsule under a receiver, and 
the airspump worked for one minute. After standing six minutes, the 
surface was frozen. 
This experiment, as well as similar ones, was attended with violent 
ebullition on the part of the liquid, throwing the water against the sides 
of the receiver, which was owing to the rapid formation of vapor on 
the under surface of the liquid. | 
II. Mineratocy anp GEoLoGy. 
1. Chloanthite, a new Binarseniet of Nickel; by A. BrEITHAUPT.— 
This ore is from Schneeberg in Saxony. It differs from white nickel 
pyrites, in its tesseral crystallization with cubic cleavage. Specific 
gravity 6-4283—6:565.. Hardness 64—7. Color tin white. Compo- 
sition, according to Mr. Booth, nickel 20:74, cobalt 3:37, iron 3°25, 
arsenic 72°64. (See this Journal, vol. xlvii, 351, and xxix, 242.) 
2. Cuban. of Breithaupt ; (Pogg. Annalen, Ixiv, 280, 1845.)—The 
mineral cuban, consists, according to C. H. Scheidauer, of sulphur 
34:78, iron 42°51, copper 22-96, with a trace of lead, affording the 
formula Fe2+Cu. . 
3. Kyrosite of Breithaupt ; (Pogg. Annalen, Ixiv, 282, 1845.)— 
‘ScHerpnaver obtains for the composition of kyrosite, sulphur 53°05, 
iron 45°60, copper 1°41, arsenic 0:93, which, excluding the copper and 
arsenic, is the composition of common sulphuret of iron. 
4. Turquois in Silesia; (Pogg. Annalen, Ixiv, 633, 1845.)—A new 
locality of this mineral near Domsdorf, in Silesia, is announced by E. 
F. Grocxer. The color is in part a light apple green, and part be- 
