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 2
... parent from which it sprang , it was natural to regard this process as an unrolling . It was natural , too , to suppose that the egg was not really formless , but that the beginnings of each part of the final organism existed within it ...
... parent from which it sprang , it was natural to regard this process as an unrolling . It was natural , too , to suppose that the egg was not really formless , but that the beginnings of each part of the final organism existed within it ...
Página 3
... parent organism . It was recognized that the form was predetermined by the ancestry , but no longer that the embryo was literally released from encasement within the structure of the egg . The evolution of the individual is thus ...
... parent organism . It was recognized that the form was predetermined by the ancestry , but no longer that the embryo was literally released from encasement within the structure of the egg . The evolution of the individual is thus ...
Página 5
... parent organisms . Thus all the variant chemical elements may have been ( hypo- thetically ) derived through influences as yet not even imagined , from the unknown and probably unknowable primitive elementi , protyl . The general ...
... parent organisms . Thus all the variant chemical elements may have been ( hypo- thetically ) derived through influences as yet not even imagined , from the unknown and probably unknowable primitive elementi , protyl . The general ...
Página 19
... parent are ever quite alike . No two cells in the body are ever exactly identical . Among plants of the same kind in the field , some are cut down by frost while others persist ; some are destroyed by drought while others en- dure ...
... parent are ever quite alike . No two cells in the body are ever exactly identical . Among plants of the same kind in the field , some are cut down by frost while others persist ; some are destroyed by drought while others en- dure ...
Página 24
... parent stem . We name and arrange them arbitrarily , in default of a means of reconstructing the whole tree , in accordance with nature's ramifications . " To continue FIG . 14. - Heron flying . ( After Marey . ) the figure , in our ...
... parent stem . We name and arrange them arbitrarily , in default of a means of reconstructing the whole tree , in accordance with nature's ramifications . " To continue FIG . 14. - Heron flying . ( After Marey . ) the figure , in our ...
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