“…in five instances, and 10, 15, and 20 units in three more). Intravitreal injection of commercial penicillin is badly borne by the experimental animal (v. Sallmann, Meyer, and Di Grandi, 1944 ;Sorsby, 1945;Mann, 1946), and this procedure has distinct clinical disadvantages. lontophoresis as advocated by v. Sallmann and Meyer (1944) also presents clinical difficulties, and is only doubtfully valid on theoretical grounds (Hamilton-Paterson, 1946).…”