be ba hdl enact 
W. Crookes—Lines of Molecular Pressure. 223 
b. On making contact with the coil, the thin film flashes out 
suddenly all over its surface with a yellowish phosphorescence, 
which, however, instantly disappears. The uncovered part o 
the plate does not become phosphorescent quite suddenly, but 
the phosphorescence is permanent as long as the coil is kept at 
work. 
c. With an exceedingly faint spark the film remains more 
luminous than the plate; but on intensifying the spark, the 
luminosity of the film sinks, and that of the uncovered part of 
the plate increases. 
d. If a single intense spark be suddenly sent though the 
tube, the film becomes very luminous, while the plate remains 
dark. 
These experiments are conclusive against the phosphores- 
cence being an effect of the radiation of the phosphorogenic 
y- : : 
Magnetic Deflection of Lines of Molecular Force.—With this 
apparatus another phenomenon was investigated. It is found 
h . 
