...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. CHAPTER I. VARIATION DNDEE DOMESTICATION. Causes of Variability — Effects of Habit and the use or...

...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,...

...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." APPENDIX Note on the Origin of Spines in Plants (p. 431). THE Rev. RP Murray, who is well acquainted...

...processes at work besides natural selection. Indeed, Darwin himself knew this, for he expressly stated: "I am convinced that natural selection has been the...important, but not the exclusive, means of modification." The Conception of "Species." — What is a "species"? The only practical criterion of species is isolation,...

...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. ORIGIN OF SPECIES CHAPTER I VARIATION UNDER DOMESTICATION .. _ .*•,• Causes of variability —...

...saisons sans coulants, Fraisier de GAILLON). conclusion of the introduction to his Origin he says, "I am convinced that natural selection has been the most important, but not the exclusive means of modification."3 In almost all works on DARWIN'S theory we find the story of how he arrived at his theory...

...but it is entirely erroneous to believe that he regarded that as the sole cause. He distinctly says:2 "I am convinced that natural selection has been the...important, but not the exclusive, means of modification." Although Darwin did not stress the idea of the transmission of acquired characters, yet it seems clear...

...but it is entirely erroneous to believe that he regarded that as the sole cause. He distinctly says:2 "I am convinced that natural selection has been the most important, but not the exclus1ve, means of modification." Although Darwin did not stress the idea of the transmission of acquired...

...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." 1 Darwin held that in nature there was an inherent and self-acting power which produced the absence...

...1859. " I am fully convinced," he wrote in the Introduction, " that species are not immutable . . . and that Natural Selection has been the most important, but not the exclusive, means of modification." Galton spoke of the publication of this work as making a marked epoch in his own mental development....