. Contributions from the Botanical Laboratory, vol. 7. Botany; Botany. Fig. 6. Hypertrophied cell in old (8 day) culture of Jensen's rat sarcoma showing, A- aggregation of fat, B-the somewhat angular (hexagonal) shape of the fat globules, and C-the pseudo-alveolar structure which results when the cell is fixed leaving "fat vacuoles". (From preparations by Miss Strangeways and published with her kind permission. d. It may be claimed that an aggregation of fat globules, even when sufficiently compact to cause them to become polygonal, is not what is meant by alveolar protoplasm. Such a
. Contributions from the Botanical Laboratory, vol. 7. Botany; Botany. Fig. 6. Hypertrophied cell in old (8 day) culture of Jensen's rat sarcoma showing, A- aggregation of fat, B-the somewhat angular (hexagonal) shape of the fat globules, and C-the pseudo-alveolar structure which results when the cell is fixed leaving "fat vacuoles". (From preparations by Miss Strangeways and published with her kind permission. d. It may be claimed that an aggregation of fat globules, even when sufficiently compact to cause them to become polygonal, is not what is meant by alveolar protoplasm. Such an objection is not valid. In Fig. 6, C, a true Butschlian structure exists, and it would be quite impossible to know from this preparation alone that these alveoli differ from those in Euplotes, yet chemically they are quite different. The introduction to this article emphasizes the fact that the pro- toplasmic emulsion may assume a variety of forms. This is true of embryonic cells in tissue-culture. The dispersed "neutral-red" granules, granular mitochondria, fat droplets, vescicles, and vacuoles, may be few (Figs. 3 and 4, PI. 1), or abundant (Figs. 7 and 8, PI. II): in the latter case the granules often form a dense mass at the end of the cell (Fig. 11, PI. II). The granules, vescicles, or fat droplets may be irre- gularly (Fig. 12, PI. HI), rather symmetrically (Fig. 10, PI. II, and Fig. 13, PI. Ill), or very diagrammatically (Fig. 9, PI. II; Fig. 5) arranged. Onlv in the last case where there are many globules of the same size and kind under pressure, does a Butschlian alveolar structure result. (Compare the above plate figures with text Fig. 20). ALVEOLAR NICLKOPLASM The macronucleus of Euplotes.—Euplotes possesses a large worm- shaped macronucleus (mac. Fig. 3). This nucleus exhibits the same typical alveolar structure as does the ectoplasm. In Fig. 1, PI. I, the alveoli are distinctly visible in the lower extremity of the nucleus, , that part of the nucl
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