โ Scribed by C.
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Photo-Electricity.--The marked influence of sunlight on the electric conductivity of selenium, led Biirnstein to experiment with other metals. He concluded that all bodies were affected by photoelectricity, but G. Hausemann, at the suggestion of Dr. Werner Siemens, entered upon investigations which appear to contradict BSrnstein's views. Dr. L. A. Forssmann, of Stockholm, finds that even the selenium experiments do not seem to depend upon the influence of either the luminous, the thermal or the chemical rays ; but upon waves of some other octave, or even, perhaps, upon longitudinal vibrations.--Ann, der _Phys. u. Crhem.
C.
๐ SIMILAR VOLUMES
## Jour. Frank. Inst, ' the same vessel, is remarked upon, and the experiments of ])urand, betbre mentioned, are alluded to. In 1880, Talbot\* glves an account of experiments upon this subjeet, alludes to ~hose of' Dul'and and Bc.rnouilli, and, in SUlnming up his results, ~,'ives the opinion that
Scientific Notes and Comments.