The Shipley Collection of Scientific Papers, Volume 331890 - Zoology |
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Page 27
... supposed to be , but that it consisted of two parts , viz . , a minute network of very delicate fibrils and an apparently homogeneous substance which occupied the interstices of the network . Stilling and Max Schultze recognised the ...
... supposed to be , but that it consisted of two parts , viz . , a minute network of very delicate fibrils and an apparently homogeneous substance which occupied the interstices of the network . Stilling and Max Schultze recognised the ...
Page 39
... supposed to be the primary , morphological unit through which hereditary qualities are transmitted . But , as is most probable , the nucleus reacts on the cell protoplasm - on the element of the cell through which the ordinary nutritive ...
... supposed to be the primary , morphological unit through which hereditary qualities are transmitted . But , as is most probable , the nucleus reacts on the cell protoplasm - on the element of the cell through which the ordinary nutritive ...
Page 40
... supposed con- tinuity of the germ plasm . He believes that in each individual produced by sexual generation a portion of the germ plasm derived from both parents is not employed in the construction 1 See his Essays " The Significance of ...
... supposed con- tinuity of the germ plasm . He believes that in each individual produced by sexual generation a portion of the germ plasm derived from both parents is not employed in the construction 1 See his Essays " The Significance of ...
Page 44
... supposed , unlimited , will be comparatively few in number . Of these changes reduction in size is the most important . The passage to the adult state is often accompanied by the loss of larval organs , and great changes in those which ...
... supposed , unlimited , will be comparatively few in number . Of these changes reduction in size is the most important . The passage to the adult state is often accompanied by the loss of larval organs , and great changes in those which ...
Page 44
... supposed it , however , to have become filled up by cells wandering in from the periphery . In the midst of these a digestive cavity was later developed , and finally the mouth was formed by the specialisation of the area through which ...
... supposed it , however , to have become filled up by cells wandering in from the periphery . In the midst of these a digestive cavity was later developed , and finally the mouth was formed by the specialisation of the area through which ...
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.