442 Miscellaneous Intelligence. 
the mercury, no longer kept down by the stream of hydrogen, yielded 
the pressure of the air, and rose in the vertical glass tube to the height 
of 740 millimetres, or very nearly the usual barometrical height. This — 
would not have happened, had there not been a nearly complete vacuum 
in the tube the instant the supply of hydrogen was cut off. But what 
had become of the hydrogen supplied before? There is but one expla 
nation possible, viz: that, notwithstanding the pressure of the atmos 
phere, the hydrogen had passed through the pores of the steel tube. 
. Hence an iron tube introduced into a furnace where there are reducing 
gases, is a most powerful instrument for carrying off all the hydrogen— 
Galignani. at 
. 6. Submarine Volcano in the Mediterranean.—Letters fro 
twenty or thirty high, composed of cinders. In its centre was the cra- 
ter, which continually emitted steam and smoke; and during the erup 
tions, which occurred on an average every hour and a half, large stones 
and cinders were thrown to the height of one thousand feet. It is mer 
tioned as a singular circumstance that about the same time that this vol 
cano first showed itself, a strong earthquake took place in the island of 
Samos, which divided a hill into two parts, leaving a valley with stream 
of water flowing through it. Recently a party of curious persons 
this wonderful island, and one of them thus reports the result of theit 
observations : "7 
“The beach, which appeared to be a mixture of ashes and sand reduced 
to a powder, was as hard as the firmest sand, but very few yards from 
the water-side the surface was extremely rough, composed of loose Ci 
- ders of all sizes heaped lightly together, so that at every step we 58 
he 
When on the top we were nearly to leeward of the crater, an fall in 
sequence was that the volume of steam that rose from it drove 1 
and perhaps thirty or forty yards across, The level of the oan 
was from twelve feet to twenty feet below the lip or highest meg aore” 
actual crater. It was much discolored and boiling strongly, throwing *P 
quantities of white steam, with this sulphurous vapor which annoy aie 
somuch. There was apparently an underground 1 septic way 
from the southeast side into the sea, which might be traced 9 long 7 
