The Shipley Collection of Scientific Papers, Volume 331890 - Zoology |
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Page 21
... acquired , therefore , much more im- portance as a mode of origin of animal cells than was accorded to it by Schwann . At the time when I began the study of anatomy and physi- ology in 1850 , the current teaching of the schools embraced ...
... acquired , therefore , much more im- portance as a mode of origin of animal cells than was accorded to it by Schwann . At the time when I began the study of anatomy and physi- ology in 1850 , the current teaching of the schools embraced ...
Page 33
... acquired distinct func- tions . Protoplasm , as above defined , is a living substance en- dowed with great functional activity . It possesses a power of assimilation , and can extract from the appropriate pabulum the material that is ...
... acquired distinct func- tions . Protoplasm , as above defined , is a living substance en- dowed with great functional activity . It possesses a power of assimilation , and can extract from the appropriate pabulum the material that is ...
Page 44
... acquired under direct external influences . But in questioning the accuracy of the proposition that somatogenic " acquired characters " are in- capable of being transmitted , I do not of course contend that all the characters which may ...
... acquired under direct external influences . But in questioning the accuracy of the proposition that somatogenic " acquired characters " are in- capable of being transmitted , I do not of course contend that all the characters which may ...
Page 44
... acquired a definite arrangement with regard to this vacuole and other organs , and thus tissues were constituted . Cell territories , in so far as they exist in the adult , he regards as due to secondary rearrangement of the protoplasm ...
... acquired a definite arrangement with regard to this vacuole and other organs , and thus tissues were constituted . Cell territories , in so far as they exist in the adult , he regards as due to secondary rearrangement of the protoplasm ...
Page 44
... acquiring the capacity for moving in a definite direction , a change would take place the form first became elongated , and it is interesting to observe that the free - swimming blastulas of both Echino- cyamus and Eudendrium have this ...
... acquiring the capacity for moving in a definite direction , a change would take place the form first became elongated , and it is interesting to observe that the free - swimming blastulas of both Echino- cyamus and Eudendrium have this ...
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.