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PLATE I. (AFTER BEALE & FREY.)
MODE OF ORIGIN OF LIVING CENTRES IN ALREADY EXISTING

BIOPLASM,

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A mucus corpuscle represented in

the living state, magpified by the 2800 diameters, showing alterations in

Fig. 6.

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form during one minute,

Fig. 5.

Germinal spots, with new centres (nucleoli) within theni and more minute germinal spots in the intervals between them. Magnited

550 diameters

Most minute ovarian ora undergoing developmnent, in the midst of a delicate tissue con. stituting the ovary and composed or cells. Tbe ouum seems to arise by the growth of one

of these. Magu: Sed 500 diameters

TE HELICTYPE PROYTINGCC.

220 DEVONSHIRE ST. BOSTON.

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