...ideas of the affinities and relationships of animal groups obtained by subsequent induction, says : ' I believe that animals have descended ' from at most only four or five progenitors,' [evidently meaning, or answering to, the type-forms of the four or five ' sub-kingdoms' in modern zoology],...

...with modification embraces all the members of the same class. I believe that animals have desconded from at most only four or five progenitors, and plants from an equal or less number. " Analogy would lead me one step further, namely to the belief that all animals and plants have descended...

...with modification to members of the same class. Then he launches out still more boldly and says : " I believe that animals have descended from at most...progenitors, and plants from an equal or less number." (Page 419.) He seems inclined to stop again at this point, but a little thought soon satisfies him...

...Notices of Books. 517 from the facts of animal and vegetable life warrants the conclusion, that Ml living animals "have descended from, at most, only four or five progenitors, and plants from an equal or lesser number. Analogy would lead me one step further, namely, to the belief that all animals and plants...

...operation of natural causes. In his work on the " Origin of Species" he snys " I believe that animals are descended from at most only four or five progenitors, and plants from an equal or lesser number." On the same page he goes much further : " Analogy would lead me one step farther, namely,...

...in the course of millions of generations and under the operation of a law of unlimited variation. " Therefore I should infer from analogy that probably all the organic beings th»t have ever lived on this earth have descended from some one primordial form, into which life was...

...excused from designating somewhat vague ideas of a community of composition, he adds this climax — " Therefore, I should infer from analogy that, probably, all the organic beings which have ever lived on this earth have descended from some one primordial form, into which life was first breathed." * 86...

...nature of things ensures the propagation of individuals in whom this divergence is maintained : this * " I believe that animals have descended from at most...four or five progenitors, and plants from an equal or lesser number." — Origin of Species, p. 484. Mr Darwin goes on to say: " Analogy would lead one step...

...descent with modification embraces all the members of the same class." Furthermore, " I believe that all animals have descended from at most only four or five progenitors, and plants from an equal or lesser number." Seeing that analogy as strongly suggests a further step in the same direction, while...

...cannot doubt that the theory of descent with modification embraces all the members of the same class. I believe that animals have descended from at most...four or five progenitors, and plants from an equal or lesser number. Analogy would lead me one step further, namely, to the belief that all animals and plants...