Observations on the Intra-Ocular Pressure in Cats

mum quantity of ether followed by chloralose 80 milligrammes per kilogramme body-weight being injected intravenously. The eye cannula, combined with the compensatory manometer without the optical arrangement, made on the lines of Sir Stewart Duke-Elder's manometer (1932), was used throughout. The cat was allowed to settle for two hours after the insertion of the cannula into the eye. The variations in the intra-ocular pressure were noted by the movements of the air bubble inside the capillary tube. The variable factors had been :? (i) the asphyxiated condition produced by allowing the cat to rebreathe its own expired air for two minutes at a time, and (ii) variations in the body temperature produced by means of the animal electric heater. The intra-ocular tension was noted first on a number of cats. Variations in the intraocular pressure were noted. Then the cats