On the Origin of Species by Means of Natural Selection, Or, The Preservation of Favoured Races in the Struggle for LifeAppleton, 1898 |
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Página 146
... Fresh - water fish , I find , eat seeds of many land and water plants ; fish are fre- quently devoured by birds , and thus the seeds might be transported from place to place . I forced many kinds of seeds into the stomachs of dead fish ...
... Fresh - water fish , I find , eat seeds of many land and water plants ; fish are fre- quently devoured by birds , and thus the seeds might be transported from place to place . I forced many kinds of seeds into the stomachs of dead fish ...
Página 171
... fresh - water produc- tions can , I think , in most cases be explained by their having become fitted , in a manner highly useful to them , for short and frequent migrations from pond to CHAP . XIII . ] FRESH - WATER PRODUCTIONS . 171.
... fresh - water produc- tions can , I think , in most cases be explained by their having become fitted , in a manner highly useful to them , for short and frequent migrations from pond to CHAP . XIII . ] FRESH - WATER PRODUCTIONS . 171.
Página 172
... fresh - water species never existed on two continents distant from each other . But Dr. Günther has lately shown that the Galaxias attenuatus inhabits Tasmania , New Zealand , the Falk- land ... FRESH - WATER PRODUCTIONS . [ CHAP . XIII ,
... fresh - water species never existed on two continents distant from each other . But Dr. Günther has lately shown that the Galaxias attenuatus inhabits Tasmania , New Zealand , the Falk- land ... FRESH - WATER PRODUCTIONS . [ CHAP . XIII ,
Página 173
... fresh- water fish belong to very ancient forms , and in such cases there will have been ample time for great geo- graphical changes , and consequently time and means for much migration . Moreover , Dr ... FRESH - WATER PRODUCTIONS . 173.
... fresh- water fish belong to very ancient forms , and in such cases there will have been ample time for great geo- graphical changes , and consequently time and means for much migration . Moreover , Dr ... FRESH - WATER PRODUCTIONS . 173.
Página 174
... fresh - water shells from the other . But another agency is perhaps more effec- tual : I suspended the feet of a duck in an aquarium , where many ova of fresh - water shells were hatching ; and I found that numbers of the extremely ...
... fresh - water shells from the other . But another agency is perhaps more effec- tual : I suspended the feet of a duck in an aquarium , where many ova of fresh - water shells were hatching ; and I found that numbers of the extremely ...
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Términos y frases comunes
admit affinity allied species ancient animals appear Archipelago arctic areas become believe birds Cambrian changes characters cies classification climate closely allied common progenitor continent crustaceans degree deposited difficulty distant distinct species domestic doubt embryo eral Europe existing extinct fact faunas fertilised fertility flowers formations formerly forms fossil fresh-water Fritz Müller Gärtner genera genus geological period geological record Glacial period groups of species habits hybrids hybrids produced important individuals inhabitants inherited insects instance intermediate intervals land larvæ less living mammals manner marine Marsupials migration modified descendants mongrels mountains natural selection naturalists nearly occur oceanic islands offspring organisation parent parent-form peculiar perfect pistil plants pollen present probably produced quadrupeds reciprocal crosses regions remains remarked reproductive resemblance rocks rudimentary organs sediment seeds Silurian South America stage stamens sterility structure successive suppose terrestrial tertiary theory tion variations varieties whilst widely different wings