The Shipley Collection of Scientific Papers, Volume 331890 - Zoology |
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Page 39
... through the segmentation nucleus . Its individuality is that which is characteristic of itself ; and arises from the fact that in the course of development a measure of variability THE CELL THEORY , PAST AND PRESENT . 39.
... through the segmentation nucleus . Its individuality is that which is characteristic of itself ; and arises from the fact that in the course of development a measure of variability THE CELL THEORY , PAST AND PRESENT . 39.
Page 40
that in the course of development a measure of variability within the limits of a common species , from the organic form exhibited by its parents and by their other offspring , is permitted . In all likelihood the variability , as ...
that in the course of development a measure of variability within the limits of a common species , from the organic form exhibited by its parents and by their other offspring , is permitted . In all likelihood the variability , as ...
Page 44
... variability , in the fate of the blastopore was first pointed out by Lankester . It is very puzzling , and has led some morphologists to regard it as a structure which is not homofo- gous in the different animals , and of no particular ...
... variability , in the fate of the blastopore was first pointed out by Lankester . It is very puzzling , and has led some morphologists to regard it as a structure which is not homofo- gous in the different animals , and of no particular ...
Page 44
... variability only which has 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 ...
... variability only which has 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 ...
Page 44
... 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 . 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 . 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.