jor the wma vi Science. “3 § 405 
Me 3 
tive or zinc end of the battery, a nice of the. same charcoal ( but Wavlane: 
ed) was attached, The experiment was then made. ib iene ‘form © ~~ 
as described by M. Jaquelin, by first making ee eet the two char et 
coal terminals, then bringing the flame in such a Position as to cau 
O surrou ott 
ctrode 
which was in a state of intense ignition, remained attached to the neg-.- ° 
: ¢ 
ative terminal. When cool it exhi ited the same state: as it now pre- mee 
te : e ; a sida 
of becoming a black capnenacec re a good conductor, it 
has a vitreous white o appearance, and remains a non-conductor. 
It has also a deep, sironlée: sau on thas. portion | which was oppositeand =| 
box-wood charcoal remaining attached to it... The centre of the cavity © *” 
“appears to be still brilliant, as if that portion of the diamond_ had not 
complete state of fusion. In-one or two reg peeing 
F gs *y 
. Rise on the iptisent State of our Knowledge o ied ig Action 
of the Solar Radiations ; by Mr. 
In this’ report the mig gave an historical sketch of ‘he progress of 
inquiry on this subject, from the period when Scheele first observed 
that the chlorid of aie was blackened much more speedily by the 
_ ays at the blue = of the spectrum than by those at the least refran- 
|. oad r red end, to the announcement of the discovery of the sensi- 
ility of the iodized. tablets to the solar influences by Daguerre and the 
the least refrangible end, and lecontleeshts sae ma at the a re- 
appear to be influenced by light—the luminous power—as distinguished 
from the purely chemical or calorific powers. The vitality of plants 
is stimulated by light; and although many functions are performed in 
the absence of luminous radiations, they all appear to be pages e by 
I i sam se e to tha 
