...geographical distribution of animals with their chronological succession, by citing the following law: — "Every species has come into existence coincident both in space and time with a pre-existing closely-allied species." Vegetation, as is manifest by Morphology, is also subject to this law: for...

...renewal of the forms of life in successive geological epochs, he has deduced the following law : — Every species has come into existence coincident both in space and time with a pre-existin9 closely allied species. The question is one of great importance, and deserving the careful...