Species

162 Species Darwin is correct on both points. The Strickland Rules, as they came to be known, did indeed originally cite the 12t ...

Darwin and the Darwinians 163 In the subsequent chapter, “Variation under nature,” he points out that there are several definiti ...

164 Species The forms which possess in some considerable degree the character of species, but which are so closely similar to ot ...

Darwin and the Darwinians 165 of creation. It is certain that many forms, considered by highly competent judges to be varieties, ...

166 Species widely extended, he will in the end generally be able to make up his own mind; but he will succeed in this at the ex ...

Darwin and the Darwinians 167 that all the species of a genus are equally distinct from each other; they may generally be divide ...

168 Species Selection is for Darwin not restricted to the intraspecific, but can be interspecific or even merely a matter of sim ...

Darwin and the Darwinians 169 young thus produced will gain so much in vigour and fertility over the offspring from long-continu ...

170 Species of spreading widely. Throughout a great and open area, not only will there be a better chance of favourable variatio ...

Darwin and the Darwinians 171 and subsequently have not varied or come to differ in any degree, or only in a slight degree, it i ...

172 Species But Darwin did not think that selection caused sterility and hence species. Rather, he held that selection incidenta ...

Darwin and the Darwinians 173 And, reiterating the comment in the Notebook: No one has been able to point out what kind or what ...

174 Species In the same manner as in grafting trees, the capacity in one species or variety to take on another, is incidental on ...

Darwin and the Darwinians 175 All the foregoing rules and aids and difficulties in classification may be explained, if I do not ...

176 Species individual, however much they may differ from each other and from the adult, as well as the so-called alternate gene ...

Darwin and the Darwinians 177 there will be a considerable revolution in natural history. Systematists will be able to pursue th ...

178 Species compiler W. S. Dallas, not of Darwin. David Williams notes that Dallas’ definition of terms like homology differed f ...

Darwin and the Darwinians 179 In a short letter to Nature, while discussing whether variations in brain structure could enable t ...

180 Species the sexual organs and the structures of the organisms, although he rejected it in a particular case.^89 Nevertheless ...

Darwin and the Darwinians 181 that species were variable populations, and so he adopted “population thinking.” However, accordin ...