Portable Test-Type.

THE apparatus described in this note might be helpful to surgeons who, like myself, have a scattered H population to cover. In this kind of area, eye clinics are, perforce, held in buildings where the ininstallation of permanent test-type f cabinets or drums is impracticable. Some form of portable test-type is therefore required. This should possess means of illuminating the chart, and should be sturdy enough to withstand hard wear, and yet light enough to transport readily from one clinic to another.