Contributions from the Biological Laboratories in Princeton University, Volume 4

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Consists of reprints of articles from various journals.
 

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Página 248 - O unwearied feet, travelling ye know not whither ! Soon, soon, it seems to you, you must come forth on some conspicuous hilltop, and but a little way further, against the setting sun, descry the spires of El Dorado. Little do ye know your own blessedness ; for to travel hopefully is a better thing than to arrive, and the true success is to labour.
Página 187 - Whitman's ('93) statement that, "The organism dominates cell formation, using for the same purpose one, several or many cells," is true within certain limits. But the differences in cell number which are unimportant are only those which are associated with growth and not with differentiation, with trophic as contrasted with morphogenetic processes. Supplementary Note. After this paper had gone to press I received an important publication by S. Morgulis entitled "Studies of Inanition in its Bearing...
Página 267 - ... products of differentiation or metabolism, and hence they exhibit youthful characteristics although the body from which they come may be senile. Another functional cause of senescence is to be found in a decrease in the power of constructive metabolism. This factor has been recently advocated by...
Página 362 - The peripheral general lymphatic channels appear to be developed by confluence of spaces independent of the venous system, although closely associated with the same. The histological picture presented by them differs radically from that of the jugular veno-lymphatic derivatives. They begin as minute extravenous vacuoles closely applied to the surface of the veins which they accompany. They enlarge as the lumen of the veins diminishes.
Página 267 - ... embryonic differentiation and it continues in many types of cells until the entire cell is almost filled with such products. Since nuclei depend upon the general protoplasm for their growth, they also become small in such cells. If this process of the transformation of protoplasm into differentiation products continues long enough it necessarily leads to the death of the cell, since the continued life of the cell depends upon the interaction between the general protoplasm and the nucleus. In...
Página 410 - George S. Huntington : The anatomy and development of the systemic lymphatic vessels in the domestic cat. Part I. The development of the systemic lymphatics in their relation to the blood vascular system. Part II. The development of the pre-azygos and azygos segments of the thoracic duct. Memoirs of the Wistar Institute of Anatomy and Biology, May, 1911. slightest evidence for 'centrifugal growth' as the fundamental principle in the genesis of the thoracic duct, nor tor its origin from multiple venous...
Página 84 - ... The results of Conklin's (1912) work upon Crepidula plana are of interest in this connection. He states (p. 25) : "The results of my measurements do not indicate that the Kernplasma-Relation of Hertwig is either a constant or self regulating ratio in the blastomeres of these eggs; on the other hand it appears to be a result rather than a cause of the rate of cell division, and consequently it is a variable rather than a constant factor. Furthermore, the size of the nucleus, in these eggs, is...
Página 25 - The results of my measurements do not indicate that the Kernplasma-Relation of Hertwig is either a constant or self regulating ratio in the blastomeres of these eggs; on the other hand it appears to be a result rather than a cause of the rate of cell division, and consequently it is a variable rather than a constant factor. Furthermore, the size of the nucleus, in these eggs, is dependent upon at least three factors: (1) The initial quantity of chromatin (number of chromosomes) which enter into the...
Página 306 - ... of the fibrils is retained in the Mormyrus forms, while it is lost in Gymnarchus, the darkstaining anisotropic substance apparently dissolving away. From what little can be predicted concerning the possible origin of the electric tissue in the other teleost forms, it is probable that the Mormyridae (including Gymnarchus) are the only fish in which the electroplax is formed as a syncytium from more than one cell. In Astroscopus, Electrophorus...
Página 90 - Protoplasmastucke unmoglich oder erschwert? Arch. f. Entw. Mech., Bd. 8. 1909 Die chemische Entwicklungserregung des tierischen Eies. Berlin, 1909. 1910 Ueber den autokatalytischen Charakter der Kernsynthese bei der Entwickelung. Biolog. Centralb., Bd. 30. LYON, EP 1904 Rhythms of susceptibility and of carbon dioxide production in cleavage. Am. Jour. Physiol., vol. 11. 1907 Results of centrifugalizing eggs. Arch. f. Entw. Mech., Bd. 23. MASING, E. 1910 Ueber das Verhalten Neucleinsaure bei der Furchung...

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