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 123
... feeding on the same and similar plants . In every case , the valleys that are nearest to each other furnish the most nearly allied forms , and a full set of the varieties of each species presents a minute gradation between the more ...
... feeding on the same and similar plants . In every case , the valleys that are nearest to each other furnish the most nearly allied forms , and a full set of the varieties of each species presents a minute gradation between the more ...
Página 124
... feeding habits of the bird , and these in most groups of wide range become nearly uniform within the limits of the family . With a great range of com- petition , each type of bird is forced to adapt itself to the special line of life ...
... feeding habits of the bird , and these in most groups of wide range become nearly uniform within the limits of the family . With a great range of com- petition , each type of bird is forced to adapt itself to the special line of life ...
Página 124
... feeding . Next to Oreomystis . on the one hand , we have Loxops and Himatione , with the bill pointed , a little longer than in Oreo- mystis , and slightly curved downward . The species , red or golden , of these two genera are ...
... feeding . Next to Oreomystis . on the one hand , we have Loxops and Himatione , with the bill pointed , a little longer than in Oreo- mystis , and slightly curved downward . The species , red or golden , of these two genera are ...
Página 124
... feeding , the noise of which can be heard for a considerable distance , renders the bird much easier to get than it otherwise would be . Its beak is always very dirty with a brown substance adhering to it which must be derived from the ...
... feeding , the noise of which can be heard for a considerable distance , renders the bird much easier to get than it otherwise would be . Its beak is always very dirty with a brown substance adhering to it which must be derived from the ...
Página 167
... fed , not with food yolk , but with the mother's blood . The parent thus becomes an immediate and most important part of the environment of the young . In man , by the growth of the family the parental environment becomes a lifelong ...
... fed , not with food yolk , but with the mother's blood . The parent thus becomes an immediate and most important part of the environment of the young . In man , by the growth of the family the parental environment becomes a lifelong ...
Outras edições - Ver tudo
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.