318 Scientific Intelligence. 
image of the star upon the slit during the time of the exposure of 
i it was also made in two halves which 
made it possible to photograph the solar spectrum, or that 
from any source of light, just above the spectrum of the star 
was so perfect that at least seven fine lines between H an 
and the wave lengths were determined by a graphical method by 
the aid of Cornu’s map of the ultra violet rays of the solar spec- 
trum, and Mascart’s table of wave lengths of the cadmium lines. 
Six spectra obtained belong to the white stars of the type of 
Vega. All the stars of this type give spectra of essentially the 
same type. The typical lines consist of twelve very large limes 
nebulous at their edges. e two less refrangible lines of this 
belong to one body. r. Huggins’ note contains a table of the 
s the star approximates to the solar type, the 
twelve typical lines become smaller and less nebulous at their 
edges; other lines present themselves and the line, which corres 
onds to K in the solar spectrum, becomes large and nebulous. 
due to the a of these planets, and the photographs of 
portions of the Moon’s surface under different conditions of illum- 
1880, p. 70. 7 
2. Direct measure of the work of Electrical Induction.—Hert 
A. von Watrennoren, guided by the principle that the work 
which a current of electricity, from a battery, affords in a con- 
ductor must be equal to the work which it is necessary to exert 
