56 Scientific Intelligence. 
9. Action of Magnets on Geissler Tubes.—M. J. Cuavrarp 
has studied somewhat at length the effect of a magnet on rarefied 
gases enclosed in capillary tubes, illuminated by an induced cur- 
rent. ‘The gases or vapors employed were H, N, O, 105, CO, 
C,H,, 8, Se, I, Br, Cl, SO,, Sif’,, SnCl,. Bodies of the chlorine 
diately extinguished in the narrow tube. This experiment suc- 
ceeds best with Cl, I,S and Se. The cessation of the light occurs 
eye. An alteration in the color or in the spectrum is 
sometimes thus produced. This effect is scarcely perceptible with 
C 
