Evolution and animal life, an elementary discussion of facts, processes, laws and theories relating to the life and evolution of animalsD. Appleton, 1908 - 489 páginas |
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Página 25
... sheep grazing in the field and the soil under its feet ; the grass and flowers on the one hand , and the stones on the other hand , in the same pasture ; there are no difficulties in the distinction here . Nor , indeed , even when we ...
... sheep grazing in the field and the soil under its feet ; the grass and flowers on the one hand , and the stones on the other hand , in the same pasture ; there are no difficulties in the distinction here . Nor , indeed , even when we ...
Página 66
... sheep , but out of pure depravity worry and kill ten times as many as they can eat . When to these plagues is added the ruin of thousands of acres from the spread of the thistle , which a canny Scot brought from the Highlands to keep ...
... sheep , but out of pure depravity worry and kill ten times as many as they can eat . When to these plagues is added the ruin of thousands of acres from the spread of the thistle , which a canny Scot brought from the Highlands to keep ...
Página 67
... sheep on grass has not been much in evidence until within the last few years , when the great destruction of indigenous birds by the gun and by poisoned grain strewn for rabbits has facilitated its increase . The devastation caused by ...
... sheep on grass has not been much in evidence until within the last few years , when the great destruction of indigenous birds by the gun and by poisoned grain strewn for rabbits has facilitated its increase . The devastation caused by ...
Página 81
... sheep found in Southern England : we have ( 1 ) the domes- tication of sheep in each of the different counties or natural areas . In the beginning men are satisfied with sheep. ARTIFICIAL SELECTION 81.
... sheep found in Southern England : we have ( 1 ) the domes- tication of sheep in each of the different counties or natural areas . In the beginning men are satisfied with sheep. ARTIFICIAL SELECTION 81.
Página 82
... sheep as sheep . Little attention is paid to the distinction among individuals . Those which are feeble , ill nourished , untamable , scant - fleeced , or otherwise unfit will be eliminated , a process which will tend to improve the ...
... sheep as sheep . Little attention is paid to the distinction among individuals . Those which are feeble , ill nourished , untamable , scant - fleeced , or otherwise unfit will be eliminated , a process which will tend to improve the ...
Outras edições - Ver tudo
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 |
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 animals and plants ants apes appear artificial selection bees beetles biologists birds body breeding butterfly called causes centrosome changes CHAPTER characters chromatin chromosomes color and pattern common crab Darwin degeneration degree descent differentiation division egg cell embryo environment existence fact factors fauna female fertilized fishes forms fossils genus germ cells habit hatched heredity honeybee host hybrid individuals influence inheritance insects instinct islands isolation kinds of animals known larva larvæ live lower male mammals matter ment modified mutations natural selection naturalists nest nucleus offspring organic evolution origin Origin of Species parasites parent phenomena plasm primitive produced protoplasm Protozoa race relation reproduction reptiles resemblance Sacculina sea anemone sexual sexual selection sheep species species-forming sperm spines stage structure substance tail theory tion traits tree variation various vertebrates Weismann wings workers young