Onychauxis, iv. 669
Oöphorectomy, iv. 290
Opium Habit, the, and Kindred Affections, v. 647
Ophthalmitis, febrile and post-febrile, iv. 761
Ophthalmology, Medical, iv. 737
Optic nerve, affections of, iv. 771
Otology, Medical, iv. 807
Ovarian cysts, extra-, iv. 293
Ovarian tumors, iv. 297
Ovaries and Oviducts, Diseases of, iv. 282