Intelligence and Miscellaneous Articles. 395 
RIDE ot = 
Gas Balearin’ Ae and VD. N. 
erry. 
Uo. SO 1:000295 | 1:00075 1:000293 | 1:0002927 
EEVOROGEN (ooo cnnseseceecanse 1000132 | 1:00065 1:000132 | 1:0001387 
Oarhonie acid. *.......<./....3. 1:000473 | 1:00115 1:000492 | 1:0004544 
Carbonic oxide ........ ...... TOO0845, |) 5 s..548 1000347 | 1:0003350 
Nitric protoxide ............ OO04OT | is. 1:000579 | 1:0005159 
RMSHeM Sa9 os. oe cc cece enes HOO0GSG" |), -.:.,.: 1:000728 | 1:000720 
UE oe Pre WOOO 2 01) Staxese. 1000476 | 1:000442 
Se gee rol einen beets 100145 | 1-001478 
Vapour of sulphurous acid.|...... 1-00260 1:00477 | 1:000704 
TP GUIE 0) CULE ae ee ee 1:00372 | 1001537 
Wepouror ebhylchloride:..| 9 ...6.) | we eeee 100766 | 1:001174 
Vapour of ethyl bromide...) ...... | waeaee 100773 | 1:001218 
| 
K, Akad. der Wissenschaften in Wien, March 19, 1885. 
FORMATION OF A STALACTITE BY VAPOUR. BY J. BROWN™. 
The following curious phenomenon occurred during the electro- 
lysis of the double chloride of aluminium and sodium fused in a 
small porcelain crucible provided with a porous partition. The 
anode was of carbon, and the cathode platinum-foil. 
A considerable quantity of vapour was given off, especially from 
about the anode, forming a white smoke and depositing a white 
substance, doubtless maimly hydrated aluminium chloride, on the 
carbon rod, and about the mouth of the crucible, ultimately closing 
up the latter all but a small hole, through which the vapour poured 
rapidly. From this hole there grew out a beautifully delicate litile 
tube about 13 inch long, and tapering from about + inch at the base 
to =4, inch in the middle of its length, after which it increased in 
diameter, and also flattened out owing to the vapour-jet coming 
close over the bend of the platinum-foil cathode, which seemed to 
cause, by some kind of eddy current, a flattening of the streain of 
vapour. 
Soon afterwards the supply of vapour slackened, and there was 
a corresponding diminution in the size of the tube in the last quarter- 
inch of its length till the end became almost closed. The formation 
of this tube seems quite analogous to that of the ordinary tubular 
lime-carbonate stalactite deposited from dropping water by contact 
with the atmosphere; only we have here a tubular deposit of hy- 
drated aluminium chloride by the combination, at the edge of the 
growing tube, of the water-vapour in the air with the anhydrous 
chloride contained in the vapour-stream. 
Belfast, March 1885. 
* Abstract of a paper read before the Belfast Natural History and 
Philosophical Society. Communicated by the Author. 
