The Principles of Biology, Volume 3D. Appleton, 1891 |
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Palavras e frases frequentes
Acrogens actions agamogenesis aggregates alimentary canal animals arise axes axillary bud axis become bilateral symmetry bones branches canal cause cells changes chlorophyll clusters colloids colour common compound compressions connexion continue contrast creatures degree differentiation direct distribution ends environment equal equilibration equilibrium evidence evolution exposed external facts fertility fish flowering plants flowers foliar organs fronds functions furnished further genesis greater growing growth habitually Hence higher homologous Hydrozoa hypothesis implies incident forces increase individuals inner integration intermittent mechanical kind layer leaf leaves less liquid mass mechanical mid-rib mode modifications molecular morphological multiplication natural selection notochord nutrition occur ossification outer pass petioles Phænogams physiological plants portion produced radial symmetry relations result second order segments shape shoot sides similarly species stem stomata structure substance supply surface tion tissue transverse strains umbel umbellules units unlike vascular vertebral column Vertebrata vertebrate vertical vessels
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Página 498 - ... equal, the correlatives of a more complex brain ; as are also those more numerous, more varied, more general, and more abstract ideas, which must also become increasingly requisite for successful life as society advances. And the genesis of this larger quantity of feeling and thought in a brain thus augmented in size and developed in structure, is, other things equal, the correlative of a greater wear of nervous tissue and greater consumption of materials to repair it. So that both in original...
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Página 515 - autogenous' elements. The italics denote the parts, more properly called processes, which shoot out as continuations from some of the preceding elements, and are termed 'exogenous': eg the diapophyses or upper 'transverse processes,' and the zygapophyses, or the ' oblique ' or ' articular processes
Página 137 - How far such differences are due to the positions of the parts in the bud ; how far the respective spaces available for the parts when unfolded affect them ; and how far the parts are rendered unlike by unlikenesses in their relations to light, it is difficult to say. Probably, these several factors operate in all varieties of proportion.
Página 432 - It is a general physiological truth that while the buildingup of the individual is going on rapidly, the reproductive organs remain imperfectly developed and inactive; and that the commencement of reproduction at once indicates a declining rate of growth, and becomes a cause of arresting growth.
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