...the introduction to the " Origin of Species " should be carefully considered. It is as fol lows : " Although much remains obscure, and will long remain...manner as the acknowledged varieties of any one species arc the descendants of that species. Furthermore, I am convinced that Natural Selection has been the...

...independently created — is erroneous. I am fully .convinced that species are not immutable ; but tlmt those belonging to what are called the same genera...modification.' It should be especially noted, adds Mr. Wallace, that all which is here claimed is now almost universally admitted, while the criticisms of...

...convinced that species are not immutable, but those belonging to what are called the same genera are lineal descendants of some other and generally extinct...important, but not the exclusive, means of modification." On page 421 of the same edition, Darwin calls attention to the fact that this passage has " been placed...

...convinced that species are not immutable, but those belonging to what are called the same genera are lineal descendants of some other and generally extinct...important, but not the exclusive, means of modification." On page 421 of the same edition Darwin calls attention to the fact that this passage has " been placed...

...convinced that species are not immutable ; but that those belonging to what are called the same genera are lineal descendants of some other and generally extinct...I am convinced that natural selection has been the main but not exclusive means of modification." It will be seen, then, that the various forms of nature,...

...convinced of its overpowering importance, and the more confidently we claim, in Darwin's own words, that it has been the most important, but not the exclusive, means of modification." 1 How is it, then, it may be asked, that a philosopher like Wallace, who has spent a lifetime in the...

...immutable, but that those belonging to what are called the same genera (eg, the crow and the rook) are lineal descendants of some other and generally extinct...one species are the descendants of that species." There are two fundamental principles which explain how species have originated. In the first place,...

...and natural selection ; indeed, at the end of his treatise he quotes with approval Darwin's judgment, that "natural selection has been the most important, but not the exclusive means of modification." Nevertheless, as he nowhere recognises any other law or cause of adaptive evolution,1 he practically...

...natural selection ; indeed, at the end of his treatise, he quotes with approval Darwin's judgement, that " natural selection has been the most important, but not the exclusive means of modification." Nevertheless, as he nowhere recognizes any other law or cause of adaptive evolution1, he practically...

...convinced that species are not immutable ; but that those belonging to what are called the same genera are lineal descendants of some other and generally extinct...important, but not the exclusive, means of modification. CHAPTEE L VARIATION UNDER DOMESTICATION'. Causes of Variability — Effects of Habit and the use or...