Evolution and Animal Life: An Elementary Discussion of Facts, Processes, Laws and Theories Relating to the Life and Evolution of AnimalsD. Appleton, 1907 - 489 páginas |
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Página 5
... less to all forms of orderly change , that is , change due to a persistent cause , a continuous force . Thus solar systems are conceivably formed from nebulæ . Thus continents and mountain chains , islands and river basins are shaped ...
... less to all forms of orderly change , that is , change due to a persistent cause , a continuous force . Thus solar systems are conceivably formed from nebulæ . Thus continents and mountain chains , islands and river basins are shaped ...
Página 12
... less This figure and the others in this chapter are introduced simply to illustrate graphically the variety of animal form . FIG . 1. - Long - horned boring beetle from Central America ( one - half natural size ) .1 varied . Pasteur has ...
... less This figure and the others in this chapter are introduced simply to illustrate graphically the variety of animal form . FIG . 1. - Long - horned boring beetle from Central America ( one - half natural size ) .1 varied . Pasteur has ...
Página 13
... less real because invisible and as varied in form and structure as in the differing effects their presence may produce . Each kind of animal or plant , that is , each set of forms which in the changes of the ages has diverged tangibly ...
... less real because invisible and as varied in form and structure as in the differing effects their presence may produce . Each kind of animal or plant , that is , each set of forms which in the changes of the ages has diverged tangibly ...
Página 16
... less , on our registers to - day are certainly far less than half of the millions which actually exist . In botany we find the same conditions . There are fewer known species of plants than animals by half , and they are more easily ...
... less , on our registers to - day are certainly far less than half of the millions which actually exist . In botany we find the same conditions . There are fewer known species of plants than animals by half , and they are more easily ...
Página 22
... less certain , and from time to time other and more FIG . 12. - Lizard walking . ( After Marey . ) subtle factors are brought to light , or the great forces them- selves are analyzed into finer component elements . But with all that we ...
... less certain , and from time to time other and more FIG . 12. - Lizard walking . ( After Marey . ) subtle factors are brought to light , or the great forces them- selves are analyzed into finer component elements . But with all that we ...
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Evolution and animal life, an elementary discussion of facts, processes ... David Starr Jordan,Vernon Lyman Kellogg Visualização integral - 1908 |
Evolution and Animal Life: An Elementary Discussion of Facts, Processes ... David Starr Jordan,Vernon Lyman Kellogg Visualização integral - 1907 |
Evolution and animal life, an elementary discussion of facts, processes ... David Starr Jordan,Vernon Lyman Kellogg Visualização integral - 1907 |
Palavras e frases frequentes
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
Passagens conhecidas
Página 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.
Página 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.
Página 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.
Página 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.
Página 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.
Página 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.
Página 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.
Página 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.
Página 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.