The Origin of Species by Means of Natural Selection: Or the Preservation of Favored Races in the Struggle for Life |
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Page xv
... forms of life thus tend to progress , in order to account for the ex- istence at the present day of simple productions , he maintains that such forms are now spontaneously gen- erated * Geoffroy Saint - Hilaire , as is stated in his ...
... forms of life thus tend to progress , in order to account for the ex- istence at the present day of simple productions , he maintains that such forms are now spontaneously gen- erated * Geoffroy Saint - Hilaire , as is stated in his ...
Page xxiv
... forms . In this same year , 1853 , Dr. Schaaffhausen published an excellent pamphlet ( Verhand . des Naturhist . Vereins der Preuss . Rheinlands , ' & c . ) , in which he maintains the development of organic forms on the earth . He ...
... forms . In this same year , 1853 , Dr. Schaaffhausen published an excellent pamphlet ( Verhand . des Naturhist . Vereins der Preuss . Rheinlands , ' & c . ) , in which he maintains the development of organic forms on the earth . He ...
Page 52
... form would be called a variety . It may be doubted whether sudden and considerable deviations of structure such as we ... forms of this kind ever do appear in a state of nature and are capable of reproduction ( which is not always the ...
... form would be called a variety . It may be doubted whether sudden and considerable deviations of structure such as we ... forms of this kind ever do appear in a state of nature and are capable of reproduction ( which is not always the ...
Page 55
... forms , not connected by intermediate varieties . Fritz Müller has described analogous but more extraordinary cases with the males of certain Brazilian Crustaceans : thus , the male of a Tanais regularly occurs under two distinct forms ...
... forms , not connected by intermediate varieties . Fritz Müller has described analogous but more extraordinary cases with the males of certain Brazilian Crustaceans : thus , the male of a Tanais regularly occurs under two distinct forms ...
Page 56
... forms of an allied dimorphic species inhabiting an- other part of the Malay archipelago . Thus also with ants , the ... forms and a male ; and that an hermaphrodite plant should produce from the same seed - capsule three distinct ...
... forms of an allied dimorphic species inhabiting an- other part of the Malay archipelago . Thus also with ants , the ... forms and a male ; and that an hermaphrodite plant should produce from the same seed - capsule three distinct ...
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Common terms and phrases
adapted affinities allied species America ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied colour common continent crossed crustaceans degree developed difficulty distinct species domestic doubt effects eggs embryo existing extinct extremely facts favourable fertilised fertility flowers formation forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hybrids important individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamellĉ larvĉ less living males mammals manner marsupials migration modified descendants natural selection naturalists nearly nest occasionally offspring organisation organs parent peculiar perfect pigeon pistil pollen present principle probably produced progenitor quadrupeds ranked remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed swimbladder tend theory tion trees variability variations varieties vary whilst whole wings young