Organs, rudimentary and aborted, ii. [315]-[318];
multiplication of abnormal, ii. [391].
Oriole, assumption of hen-plumage by a male in confinement, ii. [158].
Orkney islands, pigs of, i. 70;
pigeons of, i. 184.
Orthoptera, regeneration of hind legs in the, ii. [294].
Orthosia munda, ii. [157].
Orton, R., on the effects of cross-breeding on the female, i. 404;
on the Manx cat, ii. [66];
on mongrels from the silk-fowl, ii. [67].