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Evolution and Animal Life: An Elementary Discussion of Facts, Processes ...
David Starr Jordan,Vernon Lyman Kellogg
Visualização integral - 1908
actual adaptation animals ants appear become bees beginning believe birds body breeding called causes cells certain changes Chapter characteristic characters chromosomes closely color common complex course cross cytoplasm Darwin determine direct distinct division effects environment evidence evolution example existence eyes fact factors female fertilized fishes forces forms function germ cells give grow habit head heredity host human important individuals influence inheritance insects instinct islands isolation kinds known larva less lines live lower male marked matter means ment natural selection nucleus observation organs origin parasites parent pattern plants possible present produced protective protoplasm race region relation resemblance separated shown side similar simple single species stage structure tail theory tion traits tree true usually variation variety various varying whole wings workers young
Página 470 - 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.
Página 428 - ... 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.
Página 27 - ... 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.
Página 470 - 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.
Página 428 - 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.
Página 65 - 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.
Página 139 - 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.
Página 459 - 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.
Página 122 - 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.