Evolution and Animal Life: An Elementary Discussion of Facts, Processes, Laws and Theories Relating to the Life and Evolution of AnimalsD. Appleton, 1907 - Всего страниц: 489 |
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Стр. 4
... increasing divergence of type , by the increased specialization of certain forms , and by the closer and closer adaptation to conditions of life on the part of the forms most highly special- ized , the more perfect adaptation and the ...
... increasing divergence of type , by the increased specialization of certain forms , and by the closer and closer adaptation to conditions of life on the part of the forms most highly special- ized , the more perfect adaptation and the ...
Стр. 40
... increasing with distance . Certain ocean fishes live habitually in great depths , at from two to nearly five miles , where the pressure is equivalent to that of many hundred atmospheres . If these fishes are brought to the surface their ...
... increasing with distance . Certain ocean fishes live habitually in great depths , at from two to nearly five miles , where the pressure is equivalent to that of many hundred atmospheres . If these fishes are brought to the surface their ...
Стр. 46
... increases in size . In the same way , when. FIG . 37. - Opossum , Didelphys virginiana . ( One - tenth natural size ; photograph by W. K. Fisher . ) FIG . 38. - Praying mantis , eating a grasshopper. 46 EVOLUTION AND ANIMAL LIFE.
... increases in size . In the same way , when. FIG . 37. - Opossum , Didelphys virginiana . ( One - tenth natural size ; photograph by W. K. Fisher . ) FIG . 38. - Praying mantis , eating a grasshopper. 46 EVOLUTION AND ANIMAL LIFE.
Стр. 47
... increases in size . In the same way , when some of these albu- minous micellæ are formed anywhere , they facilitate further precipitation within their sphere of influence in such a way that the formation of other micella , instead of ...
... increases in size . In the same way , when some of these albu- minous micellæ are formed anywhere , they facilitate further precipitation within their sphere of influence in such a way that the formation of other micella , instead of ...
Стр. 54
... increased rapidly in the last few years , due primarily to the activity and leadership of the botanist de Vries ( Amsterdam ) , believe that species - forming is achieved without the aid of the selection factor ; that the actual ...
... increased rapidly in the last few years , due primarily to the activity and leadership of the botanist de Vries ( Amsterdam ) , believe that species - forming is achieved without the aid of the selection factor ; that the actual ...
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actual adaptation adult animals and plants ants appear artificial selection become bees beetles biologists birds body breeding Burbank butterfly called causes centrosome changes characters chromatin chromosomes color and pattern common crab Darwin degeneration degree division egg cell embryo environment evolution existence fact factors fauna feeding female fertilized fishes forms fossils gastrula genus germ cells habit hatched heredity honeybee host hybrid individuals influence inheritance insects instinct islands isolation kinds of animals larva larvæ legs live lower male mammals ment modified mutations natural selection naturalists nest nucleus offspring organs Origin of Species original parasites parent phenomena plasm produced protoplasm Protozoa rabbit race relation reproduction resemblance rocks Sacculina sea anemone sexual sexual selection sheep simple species species-forming sperm spines stage structure tail tetrads theory tion traits tree variation various vertebrates Vries Weismann wings workers worm young
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Стр. 466 - There is grandeur in this view of life, with its several powers, having been originally breathed by the Creator into a few forms or into one; and that, whilst this planet has gone cycling on according to the fixed law of gravity, from so simple a beginning endless forms most beautiful and most wonderful have been, and are being evolved.
Стр. 424 - ... duty of each and all of us is to try to make the little corner he can influence somewhat less miserable and somewhat less ignorant than it was before he entered it. To do this effectually it is necessary to be fully possessed of only two beliefs: the first, that the order of nature is ascertainable by our faculties to an extent which is practically unlimited; the second, that our volition counts for something as a condition of the course of events.
Стр. 23 - ... x's and y's with which he works his problems, for real entities — and with this further disadvantage, as compared with the mathematician, that the blunders of the latter are of no practical consequence, while the errors of systematic materialism may paralyse the energies and destroy the beauty of a life.
Стр. 466 - To my mind it accords better with what we know of the laws impressed on matter by the Creator, that the production and extinction of the past and present inhabitants of the world should have been due to secondary causes, like those determining the birth and death of the individual.
Стр. 424 - We live in a world which is full of misery and ignorance, and the plain duty of each and all of us is to try to make the little corner he can influence somewhat less miserable and somewhat less ignorant than it was before he entered it.
Стр. 61 - Near villages and small towns I have found the nests of humble-bees more numerous than elsewhere, which I attribute to the number of cats that destroy the mice.
Стр. 135 - Our ignorance of the laws of variation is profound. Not in one case out of a hundred can we pretend to assign any reason why this or that part has varied.
Стр. 455 - Thus, whatever system of organs be studied, the comparison of their modifications in the ape series leads to one and the same result — that the structural differences which separate man from the gorilla and the chimpanzee are not so great as those which separate the gorilla from the lower apes.
Стр. 118 - Given any species in any region, the nearest related species is not likely to be found in the same region, nor in a remote region, but in a neighboring district, separated from the first by a barrier of some sort, or at least by a belt of country the breadth of which gives the effect of a barrier.