\ma͡ɪɡɹˈe͡ɪʃən θˈi͡əɹi], \maɪɡɹˈeɪʃən θˈiəɹi], \m_aɪ_ɡ_ɹ_ˈeɪ_ʃ_ə_n θ_ˈiə_ɹ_i]\
Definitions of MIGRATION THEORY
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(1) The theory of Leber that sympathetic ophthalmia is caused by a transportation of the pathogenic agent through the lymph channels of the optic nerve; (2) the theory of Wagner that new animal species arise through adaptation to new surroundings of actively migrating or passively transported animals.
By Stedman, Thomas Lathrop