discharge in high vacua, and appeared to him to behave in a similar manner to diamond powder.
Tests
of specific gravity by immersion of the particles in borotungstate of
cadmium and iodide of methylene gave a density of 3-3 to 3-5.
The
particles appeared to consist of two kinds—one, irregular opaque black
particles; the other, translucent plates resembling flakes of mica,
generally of square or irregular shape.
When
placed in a cell in iodide of methylene and projected by an electric
lantern on the screen, they were clearly seen—the plates appeared to be
about 1/500 inch in length and of extreme thinness.
On
subjecting the powder to the blowpipe all hard particles disappeared,
leaving a yellowish-grey residue, but it should be stated that the
powder was not previously levigated to remove the lighter portions,
which would account for the residue.
