The Shipley Collection of Scientific Papers, Volume 331890 - Zoology |
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Page 44
... disuse will not suffice to account for the disappearance of external organs , as in this case all traces of ancestral history ought to disappear in internal as well as external organs , and this is not the case . The presence of food ...
... disuse will not suffice to account for the disappearance of external organs , as in this case all traces of ancestral history ought to disappear in internal as well as external organs , and this is not the case . The presence of food ...
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... disuse : a further disproof being yielded of the allegation that co- operative parts vary together , since we have here co - operative parts of which one grows while the other dwindles . # In " The All - Sufficiency of Natural Selection ...
... disuse : a further disproof being yielded of the allegation that co- operative parts vary together , since we have here co - operative parts of which one grows while the other dwindles . # In " The All - Sufficiency of Natural Selection ...
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... disuse ? If one of the eggs which she lays , capable , as Professor Weismann admits , of becoming queen , male , or worker of one or other kind , does not at a certain stage begin actively to develop its reproductive system , then those ...
... disuse ? If one of the eggs which she lays , capable , as Professor Weismann admits , of becoming queen , male , or worker of one or other kind , does not at a certain stage begin actively to develop its reproductive system , then those ...
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... disuse simultaneously . The inner digits have increased by use while the outer digits have decreased by disuse . Saying that he will not " pause to refute other apparent proofs of the transmission of acquirel characters , " Professor ...
... disuse simultaneously . The inner digits have increased by use while the outer digits have decreased by disuse . Saying that he will not " pause to refute other apparent proofs of the transmission of acquirel characters , " Professor ...
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... disuse . For , in conformity with ordinary facts of development , we may conclude that in a larva which is being so fed as that the development of the reproductive organs is becoming pro- nounced , there will simultaneously commence ...
... disuse . For , in conformity with ordinary facts of development , we may conclude that in a larva which is being so fed as that the development of the reproductive organs is becoming pro- nounced , there will simultaneously commence ...
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.