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Fig.1.

PLATE I. (AFTER BEALE & FREY.)

MODE OF ORIGIN OF LIVING CENTRES IN ALREADY EXISTING
BIOPLASM.

[graphic]

Fig. 2.

Production of formed material, layer within layer,
and its accumulation upon the surface of bioplasm,
as in an epithelial cell.

Fig. 3

Minute particle of bioplasm from living pus
corpuscle, showing the different forms which
it assumed in the course of five seconds.
X 2800.

rodoth of an inch

One of the mucus corpuscles represented in Fig 1, in a living state, magnified by the 2800 diameters, showing alterations iu form during one minute.

Fig. 5.

Fig 4.

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Most minute ovarian ova undergoing development in the midst of a delicate tissue constituting the ovary and composed of cells. The orum seeins to arise by the growth of one of these. Magnified 500 diameters.

220 DEVONSHIRE ST. BOSTON

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BIOLOGY,

WITH PRELUDES ON CURRENT EVENTS.

BY JOSEPH COOK.

"Wie ausnahmslos universell die Ausdehnung, und zugleich wie
völlig untergeordnet die Bedeutung der Sendung ist welche der Me-
-HERMANN Lotze.
chanismus in dem Baue der Welt zu erfullen hat."

THREE COLORED PLATES
AFTER BEALE AND FREY.

.CBOSTON:

JAMES R. OSGOOD AND COMPANY,
(Late Ticknor & Fields, and Fields, Osgood, & Co.)

[blocks in formation]

1877. Sept. 29,

верь.
Gift &

"The Anchor,

of Bestin.

Hile. 1865)

COPYRIGHT, 1877,

BY JOSEPH COOK.

All Rights Reserved.

FRANKLIN PRESS:
RAND, AVERY, AND COMPANY,

BOSTON.

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