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The theory that structural variations, characteristic of species and genera, are produced in animals and plants by the direct influence of physical environments, and esp., in the case of animals, by effort, or by use or disuse of certain organs.

Lamarckism as revived, modified, and expounded by recent biologists, esp. as maintaining that the offspring inherits characters acquired by the parent from change of environment, use or disuse of parts, etc.; -- opposed of Neo-Darwinism (which see, above). -- Ne`o-La*marck"i*an, a. & n.

Lamarckism.

ts and animals, and denies the inheritance of acquired characters; -- esp. opposed to Neo-Lamarckism. Weismannism is an example of extreme Neo- Darwinism. -- Ne`o-Dar*win"i*an, a. & n.