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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 least 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 remains resemblance separate shown side similar simple single species stage structure tail theory tion tree true usually variation variety various varying whole wings workers young
Página 468 - 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 426 - ... 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. To do this effectually it is necessary to be fully possessed of 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 426 - 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 137 - 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 differs, more or less, from the same part in the parents.
Página 468 - 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 120 - 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.
Página 63 - 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." Hence it is quite credible that the presence of a feline animal in large numbers in a district might determine, through the intervention first of mice and then of bees, the frequency of certain flowers in that district!
Página 311 - There are twenty-six land birds. Of these twenty-one, or perhaps twenty-three, are ranked as distinct species, and would commonly be assumed to have been here created; yet the close affinity of most of these birds to American species is manifest in every character in their habits, gestures and tones of voice.