The Shipley Collection of Scientific Papers, Volume 331890 - Zoology |
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Results 1-5 of 27
Page 44
... insects were terrestrial animals , and the aquatic larvæ mentioned show their secondary character by the fact that their respiratory organs are modified from organs adapted to air breathing . Their " tracheal " gills , 828 E. W. MACBRIDE .
... insects were terrestrial animals , and the aquatic larvæ mentioned show their secondary character by the fact that their respiratory organs are modified from organs adapted to air breathing . Their " tracheal " gills , 828 E. W. MACBRIDE .
Page 44
... insects segmentation in its earlier stages is totally suppressed , and represented merely by the multiplication of nuclei ; and in the later stages segmentation only occurs where developing organs require it , and thus a mimetic ...
... insects segmentation in its earlier stages is totally suppressed , and represented merely by the multiplication of nuclei ; and in the later stages segmentation only occurs where developing organs require it , and thus a mimetic ...
Page 80
... Insects Injurious to Crops . The old article on Photography has been entirely re - written and greatly enlarged , and a collection of formulæ and processes , from the very best authorities of the present day , has been included in it ...
... Insects Injurious to Crops . The old article on Photography has been entirely re - written and greatly enlarged , and a collection of formulæ and processes , from the very best authorities of the present day , has been included in it ...
Page
... insects " - " animal forms which do not reproduce themselves , but are always propagated anew by parents which are unlike them " ( p . 313 ) , and which therefore cannot have transmitted acquired characters . Singling out those soldier ...
... insects " - " animal forms which do not reproduce themselves , but are always propagated anew by parents which are unlike them " ( p . 313 ) , and which therefore cannot have transmitted acquired characters . Singling out those soldier ...
Page
... insects result from specially modified germ - plasms or whether they result from the treat- ment received during their larval stages . For the substantiation of his doctrine Professor Weismann is obliged to adopt the first of these ...
... insects result from specially modified germ - plasms or whether they result from the treat- ment received during their larval stages . For the substantiation of his doctrine Professor Weismann is obliged to adopt the first of these ...
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.