The Shipley Collection of Scientific Papers, Volume 331890 - Zoology |
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Page 44
... causes which are likely to modify a course of development which is primitively larval . First we must discriminate between various kinds of embryonic development . There is , in the first place , the type in which the organism is ...
... causes which are likely to modify a course of development which is primitively larval . First we must discriminate between various kinds of embryonic development . There is , in the first place , the type in which the organism is ...
Page 44
... causes - yolk and the egg - membrane . It is owing to the cramping influence of the latter that external differentia- tion of form is to a large extent lost . The gastrula of Asterina gibbosa , for instance , is almost spherical , con ...
... causes - yolk and the egg - membrane . It is owing to the cramping influence of the latter that external differentia- tion of form is to a large extent lost . The gastrula of Asterina gibbosa , for instance , is almost spherical , con ...
Page 44
... caused the homology ever to be doubted . But I think we have here two distinct questions : one deals with the blastopore or mouth of the two - layered stage in The absence of the connection dorsal to the anus in some Mollusca , Annelida ...
... caused the homology ever to be doubted . But I think we have here two distinct questions : one deals with the blastopore or mouth of the two - layered stage in The absence of the connection dorsal to the anus in some Mollusca , Annelida ...
Page 44
... caused the variability of its subsequent history . The latter view is obviously suggested by the elongated form the blastopore first assumes in many animals , extending as a slit along the whole of the ventral surface of the embryo ...
... caused the variability of its subsequent history . The latter view is obviously suggested by the elongated form the blastopore first assumes in many animals , extending as a slit along the whole of the ventral surface of the embryo ...
Page 44
... causes the adhesion of the lips of the siphonoglyphe in Peachia ( whether inter- locking of cilia as in Lamellibranch gill or what ) , but of the adhesion there can be no doubt whatever . This differentiation of the mouth and stomodæum ...
... causes the adhesion of the lips of the siphonoglyphe in Peachia ( whether inter- locking of cilia as in Lamellibranch gill or what ) , but of the adhesion there can be no doubt whatever . This differentiation of the mouth and stomodæum ...
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.