Evolution and Natural SelectionBeacon Press, 1959 - Всего страниц: 438 |
Результаты поиска по книге
Результаты 1 – 3 из 25
Стр. 199
... greater number of plants and a greater weight of dry herbage can be raised in the latter than in the former case . The same has been found to hold good when one variety and several mixed varieties of wheat have been sown on equal spaces ...
... greater number of plants and a greater weight of dry herbage can be raised in the latter than in the former case . The same has been found to hold good when one variety and several mixed varieties of wheat have been sown on equal spaces ...
Стр. 206
... greater in amount , to con- vert these three forms into doubtful or at least ... number of generations ( as shown in the diagram in a condensed and ... number of modified descendants ; for these will have the best chance of seizing on new ...
... greater in amount , to con- vert these three forms into doubtful or at least ... number of generations ( as shown in the diagram in a condensed and ... number of modified descendants ; for these will have the best chance of seizing on new ...
Стр. 227
... greater number of well - marked va- rieties than do the rarer species . I may illustrate what I mean by supposing three varieties of sheep to be kept , one adapted to an extensive mountainous region ; a second to a comparatively narrow ...
... greater number of well - marked va- rieties than do the rarer species . I may illustrate what I mean by supposing three varieties of sheep to be kept , one adapted to an extensive mountainous region ; a second to a comparatively narrow ...
Содержание
The Darwins | 5 |
An Opportunity Almost Missed | 79 |
Return of a Nautical Zoologist | 126 |
Авторские права | |
Не показаны другие разделы: 7
Другие издания - Просмотреть все
Часто встречающиеся слова и выражения
acquired action adapted afterwards Alfred Russel Wallace animals and plants apes appear archipelago Asa Gray Beagle become believe birds cause character Charles Darwin Chatham Island colour degree developed divergence domestic doubt early progenitors effect Emma Darwin Emma Wedgwood Erasmus Darwin existence expression extinct extremely fact father favourable female flower forms genera genus geological gradations greater number groups habits Henslow important increase individuals inhabitants inherited insects instance instincts intercrossing intermediate islands Josiah Wedgwood kind less Letters living lower animals Lyell Maer males mammals manner mental mind monkeys muscles natural selection naturalists never object observed occasionally offspring organs Origin of Species perfect period pollen present principle probably produced races relation remarkable Robert Waring Darwin savages sexual selection Shrewsbury skull slight structure supposed swimbladder tail tend theory tion tortoise trees variability variations varieties vertebrate voyage Wedgwood whilst young