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. 2
... distinct from the theory of evolution which existed in the dawn of biological science . When men first began to notice the changes in the animal embryo , through which , from the formless egg , little by little , the individual was ...
... distinct from the theory of evolution which existed in the dawn of biological science . When men first began to notice the changes in the animal embryo , through which , from the formless egg , little by little , the individual was ...
Стр. 13
... distinct species the extreme forms of a series concerned . In the words of the entomologist Rambur , " A species is a group of beings which in successive generations show the same characters of organization , unchanged so long as the ...
... distinct species the extreme forms of a series concerned . In the words of the entomologist Rambur , " A species is a group of beings which in successive generations show the same characters of organization , unchanged so long as the ...
Стр. 55
... distinct and peculiar to each ) , believe in what may be called orthogenetic evolution . That is , that the lines of descent are determined by the appearance of certain special determinate lines or tendencies of variation or change ...
... distinct and peculiar to each ) , believe in what may be called orthogenetic evolution . That is , that the lines of descent are determined by the appearance of certain special determinate lines or tendencies of variation or change ...
Стр. 72
... distinct functions or duties assumed by each in the business of production and care of young . For example , the long plume feathers of the male bird of paradise , the curious chitinous horns of the male leaf - chafer beetles ( Fig . 41 ) ...
... distinct functions or duties assumed by each in the business of production and care of young . For example , the long plume feathers of the male bird of paradise , the curious chitinous horns of the male leaf - chafer beetles ( Fig . 41 ) ...
Стр. 90
... distinct species . In like fashion , the Logan berry , the product of an accidental cross at Santa Cruz , in California , of the European raspberry with the native dewberry , behaves also like a distinct species , and is also much ...
... distinct species . In like fashion , the Logan berry , the product of an accidental cross at Santa Cruz , in California , of the European raspberry with the native dewberry , behaves also like a distinct species , and is also much ...
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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.