State Microscopical Society of Illinois · Chicago, Ill. : State Microscopical Society of Illinois · leaf 39
seen by Tolles immersion ^^ and Beye-piece, (= about 1400 dia.) where the focus was adjusted toshow the spherules or bright dots on dark ground; the brightdots not circular but elliptical. Depressing the lens and bringing thesurface of the valve into focus, {instead of the cone of light that…
Microscopy
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