The Origin of Species by Means of Natural Selection: The Descent of Man and Selection in Relation to SexEncyclopædia Britannica, 1955 - 659 стор. |
З цієї книги
Результати 1-3 із 91
Сторінка 134
... species of grass were to go on varying , and the varieties were continually selected which differed from each other in the same manner , though in a very slight degree , as do the distinct species and genera of grasses , a greater ...
... species of grass were to go on varying , and the varieties were continually selected which differed from each other in the same manner , though in a very slight degree , as do the distinct species and genera of grasses , a greater ...
Сторінка 185
... Distinct Species present analogous Variations , so that a variety of one Species often assumes a Character proper to an allied Species , or reverts to some of the Characters of an early Progenitor . - These propositions will be most ...
... Distinct Species present analogous Variations , so that a variety of one Species often assumes a Character proper to an allied Species , or reverts to some of the Characters of an early Progenitor . - These propositions will be most ...
Сторінка 527
... species belonging to distinct classes have often been adapted by successive slight modifications to live under nearly similar circumstances - to inhabit , for instance , the three elements of land , air and water - we can perhaps ...
... species belonging to distinct classes have often been adapted by successive slight modifications to live under nearly similar circumstances - to inhabit , for instance , the three elements of land , air and water - we can perhaps ...
Зміст
Historical Sketch | 5 |
Introduction | 17 |
Difficulties of the Theory | 197 |
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Загальні терміни та фрази
adapted admit affinities allied species analogous ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied color continent crossed crustaceans degree developed difficulty distinct species divergence doubt effects eggs embryo existing extinct extremely facts favorable fertility fishes flowers formation forms fossil genera genus geological geological periods Glacial period gradations greater number groups of species habits Hence hermaphrodites hybrids important individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ larvæ less living male mammals manner Marsupials migration Mivart modified descendants natural selection naturalists nearly nest occasionally occur offspring organs parent perfect pigeon pistil pollen present principle probably produced quadrupeds races ranked reciprocal crosses remarked resemblance rudimentary seeds sexual selection slight South America stamens sterility structure struggle successive supposed tend theory tion trees variability variations varieties vary whilst whole widely different wings young
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