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These Transactions record the proceedings of the Australian Ophthalmological Society at its sixth annual meeting held on Oct. 23, 1946, in Melbourne. The president was J. R. Anderson, whose presidential address, "Our Common Enemy, Blindness," occupies more than 25 per cent of the volume. Following this are two papers by the guest of honor, Air Commodore P. C. Livingston, of the Royal Air Force. In the first of these, "Experiences in Night Vision in the Royal Air Forces," he recounts the development of testing methods in use in the R. A. F. He discriminates between the perception of light minimum (an elementary difference in threshold discrimination) and variations in the power to synthesize form. The latter was obviously the more important, and so the well known rotating hexagon was devised. It is fully described and illustrated in the paper. It was further found that the scotopic field varied considerably from