Contributions to the Theory of Natural Selection: A Series of EssaysMacmillan and Company, 1870 - 384 pages |
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Page 19
... probably occurred at the time of the Permian formation , which will more satisfactorily account for the comparative poverty of species . to any causes but those we know to have existed C 2 THE INTRODUCTION OF NEW SPECIES . 19.
... probably occurred at the time of the Permian formation , which will more satisfactorily account for the comparative poverty of species . to any causes but those we know to have existed C 2 THE INTRODUCTION OF NEW SPECIES . 19.
Page 20
... probably often as great or greater . Now we know that there have been many complete changes of species ; new sets of organisms have many times been introduced in place of old ones which have become extinct , so that the total amount ...
... probably often as great or greater . Now we know that there have been many complete changes of species ; new sets of organisms have many times been introduced in place of old ones which have become extinct , so that the total amount ...
Page 21
... probably ( the species at least ) nearly as varied in different latitudes and longitudes as at present . What proportion do the Silurian dis- tricts bear to the whole surface of the globe , land and sea ( for far more extensive Silurian ...
... probably ( the species at least ) nearly as varied in different latitudes and longitudes as at present . What proportion do the Silurian dis- tricts bear to the whole surface of the globe , land and sea ( for far more extensive Silurian ...
Page 32
... probably the reasons why wood- peckers are scarce with us , while in the tropics they are among the most abundant of solitary birds . Thus the house sparrrow is more abundant than the redbreast , because its food is more constant and ...
... probably the reasons why wood- peckers are scarce with us , while in the tropics they are among the most abundant of solitary birds . Thus the house sparrrow is more abundant than the redbreast , because its food is more constant and ...
Page 40
... probably soon become extinct , or under favourable circumstances might each gradually lose those extreme qualities which would never be called into action , and in a few generations revert to a common type , which must be that in which ...
... probably soon become extinct , or under favourable circumstances might each gradually lose those extreme qualities which would never be called into action , and in a few generations revert to a common type , which must be that in which ...
Other editions - View all
Contributions to the Theory of Natural Selection: A Series of Essays ... Alfred Russel Wallace No preview available - 2018 |
Contributions to the Theory of Natural Selection: A Series of Essays Alfred Russel Wallace No preview available - 2016 |
Common terms and phrases
abundant action adapted alike Amboyna animals antennæ appear beautiful become bees beetles birds Borneo brain brilliant build butterflies caterpillars causes Celebes changes character closely allied species colour concealed conspicuous Crown 8vo curious Darwin Diphilus distinct Edition eggs essay evidence exactly existence external extinct Extra fcap facts faculties favourable Fcap flowers genera genus geological groups Guinea habits Heliconidæ imitation India individuals inhabiting insects instinct islands Java larvæ Lepidoptera less Malayan male Mimeta mimic mimicry mode modified Moluccas moths natural selection nectary nest never nidification number of species observations occur organic Origin of Species Ormenus Pammon Papilio Papilio Ulysses Papilionidæ peculiar perfect period phenomena POEMS Polydorus possess present probably produced protection race regions remarkable render resemble savage sexes sexual sexual selection shown structure Sumatra tail theory of natural Theseus tints tion trees tropical variation varied varieties whole wings
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