The Shipley Collection of Scientific Papers, Volume 331890 - Zoology |
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Page 18
... reproductive organ of the cell , that it is from it , as from a germinal spot , that new cells are formed , " and he cited cases in which it became developed into young cells . He subsequently , in a short paper on Centres of Nutrition ...
... reproductive organ of the cell , that it is from it , as from a germinal spot , that new cells are formed , " and he cited cases in which it became developed into young cells . He subsequently , in a short paper on Centres of Nutrition ...
Page 35
... reproductive factor . The present position of the CELL THEORY differs therefore in many important respects from the doctrine advocated by Schwann and his immediate successors . Cells are no longer regarded as of necessity bladders or ...
... reproductive factor . The present position of the CELL THEORY differs therefore in many important respects from the doctrine advocated by Schwann and his immediate successors . Cells are no longer regarded as of necessity bladders or ...
Page 37
... the offspring resemble the parents , and the species is perpetuated by hereditary transmission , so long as individuals remain to keep up the reproductive process . During sexual THE CELL THEORY , PAST AND PRESENT . 37 '
... the offspring resemble the parents , and the species is perpetuated by hereditary transmission , so long as individuals remain to keep up the reproductive process . During sexual THE CELL THEORY , PAST AND PRESENT . 37 '
Page 38
remain to keep up the reproductive process . During sexual reproduction the substance of the segmentation nucleus under- goes karyokinetic changes during the act of segmentation , and the question arises if the process of karyokinesis ...
remain to keep up the reproductive process . During sexual reproduction the substance of the segmentation nucleus under- goes karyokinetic changes during the act of segmentation , and the question arises if the process of karyokinesis ...
Page 41
... reproductive organ with its contained germ plasm being discoverable . I shall not enter into the much - disputed question of the layer or layers of the blastoderm from which the reproductive cells take their rise . But I may say that in ...
... reproductive organ with its contained germ plasm being discoverable . I shall not enter into the much - disputed question of the layer or layers of the blastoderm from which the reproductive cells take their rise . But I may say that in ...
Common terms and phrases
acquired characters Actinozoa adult alimentary Amphioxus Anatomy ancestral Annelid ants appear archenteron assume become blastopore body Burchell's zebra carapace-length cavity changes chromatin cœlom colour connection corpuscles degeneration dentary derived deviation differentiation diploblastic disuse division ectoderm eggs embryo essay evolution excretory existence explanation fact females fibres formation frontal breadth germ germ-plasm growth homologous horse hybrid hypothesis important insects instance instincts larva larvæ legs less males mare mean mesoblast Metazoa modified morphological mouth and anus natural selection nephridia nervous system neural canal nucleus number of glands nutrition observations occur ontogeny organs origin ovum Panmixia Peripatus plants plasm pores pouches present primitive streak principle produced Professor Weismann protoplasm recognised regard reproductive cells result Schwann Sedgwick segmentation nucleus segmented animals somites specialised species Spencer stage structure substance supposed telegony theory tion tissues unicellular variability variations Vertebrata Vertebrate workers yolk zebra
Popular passages
Page 65 - The elementary parts of all tissues are formed of cells in an analogous, though very diversified manner, so that it may be asserted, that there is one universal principle of development for the elementary parts of organisms, however different, and that this principle is the formation of cells.
Page 7 - XVIII. OF THE SCHEMATISME OR TEXTURE OF CORK, AND OF THE CELLS AND PORES OF SOME OTHER SUCH FROTHY BODIES...
Page 72 - PROCESSES, AND COLLATERAL INFORMATION IN THE ARTS, MANUFACTURES, PROFESSIONS, AND TRADES, INCLUDING MEDICINE, PHARMACY, AND DOMESTIC ECONOMY ; designed as a General Book of Reference for the Manufacturer, Tradesman, Amateur, and Heads of Families.