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II.—On the Formation of a Species

Published online by Cambridge University Press:  01 May 2009

John Francis Walker
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Extract

The object of this communication is to try to give a theory of what takes place when one species ischanged into another. When the species A is converted into the species B there must be an intermediatetransitional stage in which the collection of individuals is neither the species A nor the species B. I have already defined a species as a centre round which individuals are thickly clustered, and the spaces between these centres may be either devoid of individuals or contain here and there an abnormal form (Davidson's “ Suppt. Jurassic Brachiopoda,”Pal. Soc, 1876, p. 122).

Type
Original Articles
Information
Geological Magazine , Volume 2 , Issue 1 , January 1905 , pp. 15 - 17
Copyright
Copyright © Cambridge University Press 1905

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