An Easy Outline of EvolutionWatts & Company, 1903 - Всего страниц: 240 |
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... matters have , therefore , been sacrificed to the primary objects of simplicity and clearness . There are plenty of books on this important subject to be read by the more advanced student , and a list of these is given at the end of the ...
... matters have , therefore , been sacrificed to the primary objects of simplicity and clearness . There are plenty of books on this important subject to be read by the more advanced student , and a list of these is given at the end of the ...
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... matter ; science is that knowledge which enables , or tends to enable , us to assign to its true place in the series of events constituting the universe any and every thing we can perceive . " This may be put more briefly : Science is ...
... matter ; science is that knowledge which enables , or tends to enable , us to assign to its true place in the series of events constituting the universe any and every thing we can perceive . " This may be put more briefly : Science is ...
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... matter and motion , or matter and energy . Of the real nature of matter and energy we know nothing yet . But it has been found that neither matter nor energy can ever be destroyed . So that we know that matter and energy never had a ...
... matter and motion , or matter and energy . Of the real nature of matter and energy we know nothing yet . But it has been found that neither matter nor energy can ever be destroyed . So that we know that matter and energy never had a ...
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... matter ; and , with physics , it chiefly helps us to explain the basis of intelligence and the origin of life . The word " chemistry " appears to come from the name of the Egyptian god Khem . He was the god INTRODUCTION 3.
... matter ; and , with physics , it chiefly helps us to explain the basis of intelligence and the origin of life . The word " chemistry " appears to come from the name of the Egyptian god Khem . He was the god INTRODUCTION 3.
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... matters surrounding the earth as an elastic fluid envelop , to the height of about two hundred miles . We commonly ... matter and of the laws governing it in conditions of rest and motion , and in its solid , fluid , and gaseous states ...
... matters surrounding the earth as an elastic fluid envelop , to the height of about two hundred miles . We commonly ... matter and of the laws governing it in conditions of rest and motion , and in its solid , fluid , and gaseous states ...
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action amnion amphibians ancestor animals and plants apes atoms become beginning birds body bones brain breeds called catarrhine cells changes chemical chimpanzee common compound corpus callosum Darwin descended developed difficulty distinct doctrine of Evolution earth eggs elements embryo environment Eocene Evolutionist existence extinct fact favourable feet fish fissure force fore limbs gills groups Haeckel HIPPUS human important individuals inorganic insects instinct lancelet lemur less living forms living things lobe lower lowest mammals marsupials matter means modified monkeys monotremes motion muscles Natural Selection nerve notochord offspring organs Origin of Species parent period pithecanthropus erectus plants and animals platyrrhine pliocene posterior horn primates produced Professor protoplasm races reptiles resemble sagittal crest says seen skin skull Spencer stage structure struggle substance swimbladder tail teeth theory tion tissue toes universe variations varieties vertebrates whole
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Стр. 116 - There is no exception to the rule that every organic being naturally increases at so high a rate, that, if not destroyed, the earth would soon be covered by the progeny of a single pair.
Стр. 115 - I use this term in a large and metaphorical sense including dependence of one being on another, and including (which is more important) not only the life of the individual, but success in leaving progeny. Two canine animals, in a time of dearth, may be truly said to struggle with each other which shall get food and live. But a plant on the edge of a desert is said to struggle for life against the drought, though more properly it should be said to be dependent on the moisture.
Стр. 117 - In looking at Nature, it is most necessary to keep the foregoing considerations always in mind — never to forget that every single organic being around us may be said to be striving to the utmost to increase in numbers...
Стр. 117 - I marked all the seedlings of our native weeds as they came up, and out of 357 no less than 295 were destroyed, chiefly by slugs and insects. If turf which has long been mown, and the case would be the same with turf closely browsed by quadrupeds, be let to grow, the more vigorous plants gradually kill the less...
Стр. 198 - is a definite combination of heterogeneous changes, both simultaneous and successive, in correspondence with external coexistences and sequences.
Стр. 117 - If turf which has long been mown, and the case would be the same with turf closely browsed by quadrupeds, be let to grow, the more vigorous plants gradually kill the less vigorous, though fully grown plants; thus out of twenty species growing on a little plot of mown turf (three feet by four) nine species perished, from the other species being allowed to grow up freely.
Стр. 104 - Domestication,' there are two factors: namely, the nature of the organism, and the nature of the conditions. The former seems to be much the more important; for nearly similar variations sometimes arise under, as far as we can judge, dissimilar conditions; and, on the other hand, dissimilar variations arise under conditions which appear to be nearly uniform.
Стр. 192 - Evolution is an integration of matter and concomitant dissipation of motion ; during which the matter passes from an indefinite, incoherent homogeneity to a definite, coherent heterogeneity, and during which the retained motion undergoes a parallel transformation.
Стр. 153 - ... and complex eye to one very imperfect and simple, each grade being useful to its possessor, can be shown to exist ; if, further, the eye does vary ever so slightly, and the variations be inherited, which is certainly the case ; and if any variation or modification in the organ be ever useful to an animal under changing conditions of life, then the difficulty of believing that a perfect and complex eye could be formed by natural selection, though insuperable by our imagination, can hardly be considered...
Стр. 159 - MANY instincts are so wonderful that their development will probably appear to the reader a difficulty sufficient to overthrow my whole theory. I may here premise, that I have nothing to do with the origin of the mental powers, any more than I have with that of life itself.