The Shipley Collection of Scientific Papers, Volume 331890 - Zoology |
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Page 36
... transmission of properties , both as regards the constituent tissues of the organism and the individual as a whole , has been put on a more definite physical basis . The penetration of the ovum by the spermatozoon , originally seen by ...
... transmission of properties , both as regards the constituent tissues of the organism and the individual as a whole , has been put on a more definite physical basis . The penetration of the ovum by the spermatozoon , originally seen by ...
Page 37
... . Hence the offspring resemble the parents , and the species is perpetuated by hereditary transmission , so long as individuals remain to keep up the reproductive process . During sexual THE CELL THEORY , PAST AND PRESENT . 37 '
... . Hence the offspring resemble the parents , and the species is perpetuated by hereditary transmission , so long as individuals remain to keep up the reproductive process . During sexual THE CELL THEORY , PAST AND PRESENT . 37 '
Page 39
... transmission of specific characters 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 ...
... transmission of specific characters 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 ...
Page 43
... transmission from generation to generation unaffected by its surroundings . But as in each in- dividual a stage of diffusion or non - isolation precedes that of differentiation into the special reproductive apparatus , it follows that ...
... transmission from generation to generation unaffected by its surroundings . But as in each in- dividual a stage of diffusion or non - isolation precedes that of differentiation into the special reproductive apparatus , it follows that ...
Page 44
... transmission to the offspring , through the reaction of the soma on the germ plasm , of characters which may be acquired under direct external influences . But in questioning the accuracy of the proposition that somatogenic " acquired ...
... transmission to the offspring , through the reaction of the soma on the germ plasm , of characters which may be acquired under direct external influences . But in questioning the accuracy of the proposition that somatogenic " acquired ...
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.