Physics and Chemistry. 417 
3. Spectral observations of the star R in Gemini.—Sxccut has 
also examined the spectrum of the variable star R Gemini (R. A. 
in the spectrum of « Orionis intermediate between 6 and D, 
From this it appears that the spectrum of this star is analogous 
to that of the variable star in Corona Borealis which appeared in 
eee 
1866.— Comptes Rendus, |xviii, 361. 
Pp ‘ 
vary in intensity, fineness and mode of grouping and ex- 
Tn this 
tant. The solar spectrum proper continues visible as far as 2210, 
ydrogen compressed by occlusion in the metal numbers varying 
from 1°708 to 2°055, the mean of the numbers accepted being 
1951. The author considers the hydrogen under these circum- 
Ad 7 
plate of palladium one millimeter in thickness and one square 
meter of surface, the temperature being a little below the melt- 
ing point of gold. From the above it appears that hydrogenium 
