Habit and intelligence in their connexion with the laws of matter and force |
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Common terms and phrases
acquired action adaptive affinity Alg¿ animals appears Arthropods Ascidian become belong Bipinnaria birds breed bud-variation buds cause cells Ceratodus chapter character chemical classification colour connexion consciousness consists Crustacea Darwin depends descended distinct doubt Echinodermata Echinoderms effect energy evolution existence external fact favourable variation fertilized Fishes flowers functions furcula Ganoid ganoid scales genera genus germ germinal matter hybrid Hydrozoa Ibid individual inherited Insects instincts Intelligence kind larva larv¿ laws of habit mature Medusa mental mentioned metamorphoses modification motor muscles muscular natural selection Nauplius nectarine nerves nervous nutritive occur offspring organisms Origin of Species parents peach peculiar peloric plants pollen possible probably produced propagated race reproductive zooids resemblance reversion scarcely seed seen sensation sexual similar spontaneous stimulus structure Teleostean tendency theory tion tissues transformation true unlike variable Variation under Domestication varieties vegetative Vertebrates vital wings Zoea zooids
Popular passages
Page 40 - ... of an electric spark, which traverses a mixture of oxygen and hydrogen ? What justification is there, then, for the assumption of the existence in the living matter of a something which has no representative, or correlative, in the not living matter which gave rise to it ? What better philosophical status has "vitality
Page 43 - But in the heavens we discover by their light, and by their light alone, stars so distant from each other that no material thing can ever have passed from one to another, and yet this light, which is to us the sole evidence of the existence of these distant worlds, tells us also that each of them is built up of molecules of the same kinds as those which we find on earth.
Page 259 - We come to a still more extraordinary part of the imitation, for we find representations of leaves in every stage of decay, variously blotched, and mildewed, and pierced with holes, and in many cases irregularly covered with powdery black dots, gathered into patches and spots, so closely resembling the various kinds of minute fungi that grow on dead leaves, that it is impossible to avoid thinking at first sight that the butterflies themselves have been attacked by real fungi.
Page 39 - When hydrogen and oxygen are mixed in a certain proportion, and an electric spark is passed through them, they disappear, and a quantity of water, equal in weight to the sum of their weights, appears in their place. There is not the slightest parity between the passive and active powers of the water and those of the oxygen and hydrogen which have given rise to it.
Page 43 - No theory of evolution can be formed to account for the similarity of molecules, for evolution necessarily implies continuous change, and the molecule is incapable of growth or decay, of generation or destruction. None of the processes of nature, since the time when nature began, have produced the slightest difference in the properties of any molecule We are therefore unable to ascribe either the existence of the molecules or any of their properties to the operation of any of the causes which we...
Page 239 - There can also be little doubt that the tendency to vary in the same manner has often been so strong that all the individuals of the same species have been similarly modified without the aid of any form of selection.
Page 359 - And assuredly, there is no mark of degradation about any part of its structure. It is, in fact, a fair average human skull, which might have belonged to a philosopher, or might have contained the thoughtless brains of a savage.
Page 40 - ... be able to see our way as clearly from the constituents of water to the properties of water as we are now able to deduce the operations of a watch from the form of its parts and the manner in which they are put together. Is the case in any way changed when carbonic acid, water, and...
Page 537 - ... ever-grinding wheelwork there exists a power not subject to but partly master of the machine; you may believe that man possesses such a power, and if so, no better conception of the manner of its action could be devised than the idea of its deflecting the atoms in their onward path to the right or left of that line in which they would naturally move.
Page 178 - ... armed with their cumbrous antlers), the spike-horn is a more effective weapon than the common antler. With this advantage the spike-horn bucks are gaining upon the common bucks, and may, in time, entirely supersede them in the Adirondacks. Undoubtedly, the first spike-horn buck was merely an accidental freak of nature. But his spike-horns gave him an advantage, and enabled him to propagate his peculiarity. His descendants having a like advantage, have propagated the peculiarity in a constantly...