The Whence and the Whither of Man: A Brief History of His Origin and Development Through Conformity to Environment; Being the Morse Lectures of 1895C. Scribner's Sons, 1897 - 312 pagine |
Dall'interno del libro
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Pagina v
... volvox . - Embryonic development . - Turbellaria : Appearance of a body wall , of ganglion , and nerve - cords . CHAPTER III WORMS TO VERTEBRATES : SKELETON AND HEAD . 55 Worms and the development of organs . - Mollusks : The external ...
... volvox . - Embryonic development . - Turbellaria : Appearance of a body wall , of ganglion , and nerve - cords . CHAPTER III WORMS TO VERTEBRATES : SKELETON AND HEAD . 55 Worms and the development of organs . - Mollusks : The external ...
Pagina xii
... volvox , etc. - would not affect this result . By a change in the form of our history we have eliminated to a large extent the sources of uncertainty and error . And the dominant function of a group throws no little light on the details ...
... volvox , etc. - would not affect this result . By a change in the form of our history we have eliminated to a large extent the sources of uncertainty and error . And the dominant function of a group throws no little light on the details ...
Pagina 40
... Volvox is also a spheroidal organism , composed of- ten of a very large number of flagellated cells . But it differs from magosphæra in certain important respects . In the first place its cells have chlorophyl , the green coloring ...
... Volvox is also a spheroidal organism , composed of- ten of a very large number of flagellated cells . But it differs from magosphæra in certain important respects . In the first place its cells have chlorophyl , the green coloring ...
Pagina 41
... volvox never was an animal , it might still serve very well to illustrate a stage through which animals must have passed . The cells of volvox do not form a solid mass , but have arranged themselves in a single layer on the out- er ...
... volvox never was an animal , it might still serve very well to illustrate a stage through which animals must have passed . The cells of volvox do not form a solid mass , but have arranged themselves in a single layer on the out- er ...
Pagina 42
... volvox they are entirely subservient to , and exist for , the reproductive cells , and die when they have completed their service of these . The body is here only a vehicle for ova . Furthermore , in volvox there has arisen such an ...
... volvox they are entirely subservient to , and exist for , the reproductive cells , and die when they have completed their service of these . The body is here only a vehicle for ova . Furthermore , in volvox there has arisen such an ...
Altre edizioni - Visualizza tutto
The Whence and the Whither of Man: A Brief History of His Origin and ... John Mason Tyler Visualizzazione completa - 1896 |
The Whence and the Whither of Man: A Brief History of His Origin and ... John Mason Tyler Visualizzazione completa - 1896 |
The Whence and the Whither of Man: A Brief History of His Origin and ... John Mason Tyler Visualizzazione completa - 1899 |
Parole e frasi comuni
advance amoeba amphibia anatomical ancestors animal kingdom annelid apes appear appetite archenteron attained become better birds body brain cells conformity to environment conscious degeneration dominant ectoderm embryo embryology existence experience eyes fish functions future ganglion gastrula gills give groups higher animals higher forms highest human hydra important increase individual insect instinct intelligence jaws knowledge laws layer legs living locomotion lower mammals man's marsupial membrane ment mental mind mode modified mollusks moral mouth muscles muscular muscular system mutability of species natural selection nephridia nerve nervous system never notochord nutriment organs oxygen parapodia perception perivisceral cavity possible primitive probably progress protoplasm protozoa purely race reflex action reptiles result schematic worm segments selfish sense-organs sequence shell skeleton species spermatozoa stage structure struggle surface survive swimming theory of evolution tion tissues true truth turbellaria unselfishness variation velopment vertebrates volvox young