The Shipley Collection of Scientific Papers, Volume 331890 - Zoology |
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Results 1-5 of 39
Page 36
... represents both parents . The cells derived from the segmentation nucleus in the early stage of segmentation contain chromatin nuclear particles , which are in direct descent from the chromatin fibres of the segmentation nucleus , and ...
... represents both parents . The cells derived from the segmentation nucleus in the early stage of segmentation contain chromatin nuclear particles , which are in direct descent from the chromatin fibres of the segmentation nucleus , and ...
Page 38
... represents several tissues which have not yet differentiated . From the epiblast , for example , tissues so diverse in structure and function as cuticle and nerve tissue arise . Now , if there be a special karyokinetic process for the ...
... represents several tissues which have not yet differentiated . From the epiblast , for example , tissues so diverse in structure and function as cuticle and nerve tissue arise . Now , if there be a special karyokinetic process for the ...
Page 44
... represents a larval stage passed over inside the uterus or egg - membrane and modified in con- sequence . Thus the chick during the first four or five days of its existence is to be regarded as an immensely modified larva . If this view ...
... represents a larval stage passed over inside the uterus or egg - membrane and modified in con- sequence . Thus the chick during the first four or five days of its existence is to be regarded as an immensely modified larva . If this view ...
Page 44
... represents a larval stage passed over inside the uterus or egg - membrane and modified in con- sequence . Thus the chick during the first four or five days of its existence is to be regarded as an immensely modified larva . If this view ...
... represents a larval stage passed over inside the uterus or egg - membrane and modified in con- sequence . Thus the chick during the first four or five days of its existence is to be regarded as an immensely modified larva . If this view ...
Page 44
... represented only by those members which are absolutely necessary . Another change which larvæ are prone to undergo , is the acquisition of transparency . What results this carries in its train will be men- tioned below . Finally , the ...
... represented only by those members which are absolutely necessary . Another change which larvæ are prone to undergo , is the acquisition of transparency . What results this carries in its train will be men- tioned below . Finally , the ...
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.