On the Origin of Species by Means of Natural Selection: Or The Preservation of Favored Races in the Struggle for Life, 2권D. Appleton, 1888 - 458페이지 |
도서 본문에서
77개의 결과 중 1 - 5개
10 페이지
... greater degree , to the males alone . A much more important rule , which I think may be trusted , is that , at whatever period of life a peculiarity first appears , it tends to re - appear in the offspring at a corresponding age ...
... greater degree , to the males alone . A much more important rule , which I think may be trusted , is that , at whatever period of life a peculiarity first appears , it tends to re - appear in the offspring at a corresponding age ...
19 페이지
... greater number of generations . In a breed which has been crossed only once , the tendency to revert to any character derived from such a cross will naturally become less and less , as in each succeed- ing generation there will be less ...
... greater number of generations . In a breed which has been crossed only once , the tendency to revert to any character derived from such a cross will naturally become less and less , as in each succeed- ing generation there will be less ...
31 페이지
... greater or less force of inheritance and rever- sion determine whether variations shall endure . Variability is governed by many unknown laws , of which correlated growth is probably the most important . Something , but how much we do ...
... greater or less force of inheritance and rever- sion determine whether variations shall endure . Variability is governed by many unknown laws , of which correlated growth is probably the most important . Something , but how much we do ...
38 페이지
... greater amount of difference than that between the local forms and sub - species , they are almost universally ranked by naturalists as true species . Never- theless , no certain criterion can possibly be given by which variable forms ...
... greater amount of difference than that between the local forms and sub - species , they are almost universally ranked by naturalists as true species . Never- theless , no certain criterion can possibly be given by which variable forms ...
40 페이지
... greater part of our species are clearly limited , and that the doubtful species are in a feeble minority . This seemed to be true , so long as a genus was imperfectly known , and its species were founded upon a few specimens , that is ...
... greater part of our species are clearly limited , and that the doubtful species are in a feeble minority . This seemed to be true , so long as a genus was imperfectly known , and its species were founded upon a few specimens , that is ...
기타 출판본 - 모두 보기
자주 나오는 단어 및 구문
adapted admit affinities allied species America analogous ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied colour continued crossed crustaceans degree developed difficulty distinct species doubt effects eggs embryo existing extinct extremely facts favourable fertilised fertility flowers formation formerly forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number habits Hence hybrids important individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ larvæ less living male mammals manner Marsupials migration modified descendants natural selection naturalists nearly nest occasionally occur oceanic islands offspring organisation organs parent peculiar perfect pigeon pistil pollen present preserved principle probably produced quadrupeds ranked reciprocal crosses remarked reproductive resemblance rudimentary seeds sexual selection slight South America stamens sterility structure struggle successive supposed tend theory tion variability variations varieties vary whilst whole wings young