A Comparative Study of the Cytology and Movements of the Cyanophyceae

Front Cover
University of Pennsylvania, 1904 - Cyanobacteria - 99 pages
0 Reviews

What people are saying - Write a review

We haven't found any reviews in the usual places.

Other editions - View all

Common terms and phrases

Popular passages

Page 234 - In accepting this view we admit that the cytoplasm of the egg is, in a measure, the substratum of inheritance, but it is only by virtue of its relation to the nucleus, which is, so to speak, the ultimate court of appeal. The nucleus cannot operate without a cytoplasmic field in which its peculiar powers may come into play; but this field is created and moulded by itself. Both are necessary to development; the nucleus alone suffices for inheritance of specific possibilities of development.
Page 424 - Botanical Club," Volume XXIV, 1897, are : "Notes on some undescribed and little known plants of the Alabama Flora," by Dr. Charles Mohr. On page 23 he refers thus to Sarracenia flava Catesbaei (Elliott) : "Near the type differs in habit of growth and range of distribution. Leaves rarely over 12 inches long, with a very narrow wing, erect hood, dark purple veined ; the lamina covered with a fine silky pubescence, apparently confined to the mountains of South Carolina and Alabama. Alabama, DeKalb County,...
Page 341 - Funaria upwards, the connection between plastids and nucleus is evident, while striking resemblances in their finer histological details are undoubted. It seems therefore not unnatural to suppose that plastids primarily represent nuclear differentiations of the cell, which have been separated off for the special purpose of metabolizing special fruit constituents, the nucleus in the process being left as the special directive centre of each cell. While it may be extremely difficult to secure positive...
Page 422 - S. fiava by its darkly colored purple veins and heavy appendix. My specimens agree exactly with the figure in Catesby, to which I have referred, and were collected by Dr. Macbride along the margins of the rivulets amidst the high sand hills of Chesterfield district in South Carolina. The flowers I have not seen.
Page 422 - This plant which has probably been united with the S. flava, and which can be connected with no other species, appears to me sufficiently distinct; it differs by its rigidly erect leaves, by its throat, which is straight and not expanding, and by its appendix, of which the sides are not reflected. It differs also from the S.
Page 324 - ... Beitrage zur Biologic der Phycochromaceen." Archiv f. mikrosk. Anat., Bd. iii, 1867. 17. Cohn. — "Untersuchungen ueber Bakterien." Beitrage z. Biologic der Pflanzen, Bd. i, 1872. 18. Correns. — "Zur Anatomic und Entwicklungsgeschichte der extranuptialen Nectarien von Dioscorea." Sitz.-Ber. d. K. Acad d. Wiss., Wien, M.-N. Cl., Bd. xcvii, 1888. 19. Crato. — "Beitrage zur Anatomic u. Physiologic d. Elementarorganismus." Cohn's Beitrage z. Biologic d. Pflanzen, Bd. vii, 1896. 20. De Bary....
Page 423 - Catesbaei, while both Willdenow and Pursh quote the same figure as belonging to 5". flava." Founding, therefore, on Elliott's description alone, a species is indicated by "its throat which is straight and not expanded, by its appendix of which the sides are not reflected," and it is further distinguished by its "hairy appendix.
Page 423 - Elliott's Sarracenia, Catesbaei, is, as I have ascertained by the inspection of his herbarium, scarcely even a variety of this species, and differs from the ordinary form of the plant only by the more conspicuous veins and pubescence of the lamina. It agrees very well with the figure in Catesby, which Elliott refers to his S. Catesbaei, while both Willdenow and Pursh quote the same figure as belonging to 5". flava." Founding, therefore, on Elliott's description alone, a species is indicated by "its...
Page 259 - There were usually two types of granules present, one set which stained with haematoxylin, and contained "masked" iron and phosphorus and therefore resembled chromatin, but which became dissolved by artificial gastric digestion. These, which he called "granules of the first type," were hollow when they became large and divided at the time of cell division. They were usually found in the peripheral part of the central body, though they might extend to its central part or to the inner portion of the...
Page 449 - Fig. 7. Fig. 8. Fig. 9. Fig. 10. Fig. 12. Fig. 11. Fig. 13. Fig. 14. STRUCTURE OF EPIPHEGUS. Fig. 15. Vol II, Plate XXXII.

Bibliographic information