268 Scientific Intelligence. 
SCIENTIFIC INTELLIGENCE. 
I, CHEMISTRY AND PHYSICS. 
1. On the Nature of eee and on the Condition of the — a 
Face ; by Joan W. Drarzr, M.D., Professor of Chemistry and P 
ology in the University of Naw York—(L., E. and D. Phil. Mag., a be ; 
90. oe mong the recent publications on photo-chemistry, there is one 
vy or Dove on the Electric Light (Phil. Mag., Nov., 1857) which 
will dentalens attract the attention of those interested in that branch of 
science. Examination by the prism, and by absorbing and reflecting — 
ored bodies, leads him to the a ag that it is necessary to consider 
ae Tuminons gers ce as havi o distinct sources :—Ist, the ignition ei 
e of the shatactak chaticiex bodily passing in the course oF 
the i Shares, 2dly, the proper electrical light itself. As res eee. 
first, he illustrates its method of increase from low to high temperatures, 
by supposing a screen to be withdrawn from the red end of the spectrum 
shiek the colored spaces successively towards the violet; and vf 
the latter from the bluish brush to the ca Leyden sparks, by a 
screen drawn from the violet towards the 
The true electric light exhibits ebnieicn resembling those observed in 
actual combustions, as though there was an oxydation of a portion of the 
translated matter when the spark is taken in air. The order of evolution 
of rays in this instance happens to be the same as in the second illustra- 
tion of Professor Dove, that is, from the violet s sa red, There are cer 
tain facts connected sila ee ae of color which are not gene 
rally known, and deserve to be pointed ou 
In the Philosophical Mn gatics (Feb., "1e48) I showed er 
that there is a relation between the color of a flame an 
are evolved in their Se order of refrangibility. 
_ _ The flame of a candle or lamp roe of a series of concentric huminows 
: shells, sarroundinig a Sigal dark core. These shells shine with different 
differently colored shells of ei a flame thus consists, may be 
parted out from one another, and demonstrated ay a prism. Their 
slower rate at which combustion occurs at points more 
s the i terior. On the outside, which we may say is in 
combustion d complete, am. 
