Comments on CGS’s The natural conditions of existence [1881] and on views of Moritz Wagner on geographical distribution.
Discusses cause of variability.
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Comments on CGS’s The natural conditions of existence [1881] and on views of Moritz Wagner on geographical distribution.
Discusses cause of variability.
Thinks CGS right not to reply to critical article by Lankester.
Discusses direct action of environment as cause of variability; the finding of Hermann Hoffmann that direct action of environment affects plants very little.