| Influence of Sodium upon Flame. : 
_ who attributes A and B to potassium. The red and yellow of 
_ the spectrum of water-vapor are more brilliant than the blue 
is transmitted. Prof. Cooke has, however, discovered and 
the influence of the vapor of water upon the phenomenon in 
question. 
A new property of magnesium.—One evening while preparing 
some perchlorid of manganese, MnCl? (this Journal, [2], xli, 
107), with the peroxyd of manganese, the chlorhydric acid of 
commerce and ether, I observed that the color was not green, as 
it appeared to be in the daytime, but black. I was using gas for 
a light, and substituted in place of it first an oil lamp an er- 
ward a wax candle, but the effect was the same, the color still 
appeared only black. 
The green color reappeared by the flame of magnesium, which 
comports itself in this respect like the light of the sun. Itis well 
__ known that bright-tinted flowers, colored stuffs, or pictures, ex- 
hibit much less brilliancy of coloring by wax or even gas light 
_ than when seen by the light of day, and should an artist, at the 
5 \ ea 5 wie 
e influence of sodium upon flame.—On inquiring the 
E of i ame deception, as well as if it were daylight. 
he 
ups A and C and a large part of B, Sea to Kirchhoff, 
for the extinction of color by the usual flame, which we have 
