The Collaborative International Dictionary of English v.0.48:

Transformism \Trans*form"ism\, n. [F. transformisme.] (Biol.)
   The hypothesis, or doctrine, that living beings have
   originated by the modification of some other previously
   existing forms of living matter; -- opposed to abiogenesis.
   --Huxley.
   [1913 Webster]
   [1913 Webster]