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Physics and Chemistry. 111 
e length 
Do 
the particles of the substance are separated. The condition of the 
. matter during its transport, whether liquid, solid, or gaseous, could not 
be determined. The appearance of the deposit, in some instances, in- 
dicated that the matter had been in a liquid or gaseous state. 
The well known difference of temperature at the two poles was ex- 
amined under various circumstances. M. de la Rive considers that 
the higher temperature of the positive pole and the separation of mat- 
ter from that one alone, shows that the substance undergoes vibrations 
or mechanical actions, not communicated to the matter in connexion with 
the negative pole. very curious experiment seems to prove that this 
supposition is correct. 
If the poles are formed of two pointed, soft iron rods, the flame may 
be drawn out to a length of six millimetres. If the rods are then mag- 
of an electro-magnet,) the are immediately disappears, and does not 
the are reappears, but totally different in character. The arc can now 
only be drawn out to one-third its former length, and consists of snap- 
. de la Rive concludes with a still more curious experiment. The 
ti . be greatly in- 
creased, when one of the irons is replaced by another metal, or still 
better by a point of coke or hard charcoal. The sound then becomes 
reate : 
Positive pole, than : commonly thought to take place. With a battery 
of the same size as that used in the foregoing experiments, that deposit, 
in a Short time, covered the sides of the glass vessels used to such an 
amount, that-the light was greatly diminished. The purity of the car- 
bon had nothing to do with this effect, which was produced when either 
gas-carbon, coke or charcoal was used. | C. 8. 
10. On Electro-Physiology ; by Prof. Marrevect.—(Proceed. Brit. 
Assoc., from Athen., Sept. 26, 1846.) —Prof. Matteucci submitted to the 
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