Lesage supposed space to be overrun in all directions by currents of _ultramundane_ corpuscles.

This hypothesis, contested by Maxwell, is interesting.

It might perhaps be taken up again in our days, and it is not impossible that the assimilation of these corpuscles to electrons might give a satisfactory image.[28] [Footnote 28: M.Sagnac (_Le Radium_, Jan.

1906, p.

14), following perhaps Professors Elster and Geitel, has lately taken up this idea anew .-- ED.] M.Cremieux has recently undertaken experiments directed, as he thinks, to showing that the divergences between the phenomena of gravitation and all the other phenomena in nature are more apparent than real.