The Shipley Collection of Scientific Papers, Volume 331890 - Zoology |
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Page 44
... archenteron functionless , and as it still remains functionless when the plan of absorbing nutriment from the uterus through the general surface is introduced it is deferred in development , and in fact the destiny of the first products ...
... archenteron functionless , and as it still remains functionless when the plan of absorbing nutriment from the uterus through the general surface is introduced it is deferred in development , and in fact the destiny of the first products ...
Page 44
... archenteron ; when the lumen of the latter is small , and its walls are composed of only a few large cells , the mesodermic walls of the cœlom are represented by a single large cell on each side . A little consideration will throw light ...
... archenteron ; when the lumen of the latter is small , and its walls are composed of only a few large cells , the mesodermic walls of the cœlom are represented by a single large cell on each side . A little consideration will throw light ...
Page 44
... archenteron was formed . " Lankester's view finds its chief support in the development of Geryonia . In fact , this form is the only known one in which such a process as he supposes to have taken place in the blastula ancestor appears ...
... archenteron was formed . " Lankester's view finds its chief support in the development of Geryonia . In fact , this form is the only known one in which such a process as he supposes to have taken place in the blastula ancestor appears ...
Page 44
... archenteron formed . The cells at the anterior end , on the contrary , are in the best position for receiving stimuli from the outer world ; and here we should expect the first sense - organ to appear , and it is just at this spot that ...
... archenteron formed . The cells at the anterior end , on the contrary , are in the best position for receiving stimuli from the outer world ; and here we should expect the first sense - organ to appear , and it is just at this spot that ...
Page 44
... archenteron or cœlom arose as a split in a solid mass of cells . The history affords also an explanation of that rigorous separation of primary and secondary body cavities , the blastocœle or hæmocœle , and the cœlom , which all recent ...
... archenteron or cœlom arose as a split in a solid mass of cells . The history affords also an explanation of that rigorous separation of primary and secondary body cavities , the blastocœle or hæmocœle , and the cœlom , which all recent ...
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.