Amongst the heroic aviators who have made the supreme sacrifice is Lieutenant William Herbert Stuart Garnett, R.F.C., who was killed while making a flight. While still at the university, Mr. Garnett, who in 1903 took a First Class in the Mechanical Science Tripos, wrote a book on the turbine engine, which went through several editions, and was translated into German. After a brief spell as a master at Eton, he was called to the Bar, and though he did not practise, he produced a valuable book on ‘Children and the Law.’ Mr. Garnett had made a special study of the National Insurance Act, and joined the legal department of the Commission when it was set up. On the outbreak of war he joined the R.N.V.R., and did valuable work in mine-sweeping for nearly a year. He was a son of Dr. William Garnett, the eminent educationalist. Many other men of high promise have made the great sacrifice. Captain Keith Lucas, R.F.C., who was killed in a flying accident on October 5, 1916, had already acquired a world-wide reputation as one of the most promising physiologists of the younger generation. Captain Lucas was born in 1879, was the son of Francis Robert Lucas, and was educated at Rugby and Trinity College, Cambridge, of which he became a Fellow in 1904. He was elected F.R.S. in 1913, and was invited to give the Croonian lecture to the Royal Society even a year before his election to it. Before the war he was fully engaged in both teaching and research work at Cambridge, and was, moreover, one of the directors of the Cambridge Scientific Instrument Company. But on the outbreak of war all this was put aside in order that he might devote his rare instrumental skill and inventiveness to the Flying Services. Lieutenant Anderson Mann, R.F.C., who lost his life whilst on active service on August 9, 1916, was twenty-one years of age, and was educated at Ardvreck, Charterhouse and Trinity College, Cambridge. Mr. Mann was the best rifle shot of his year in the Public Schools. On the outbreak of war he was gazetted to the Scottish Rifles, and joined the R.F.C. in March last. Shortly afterwards he and his pilot distinguished themselves by bringing down eight German aeroplanes in seven days. They were each awarded the Military Cross for consistent gallantry and skill. Mr. Mann was the eldest son of Mr. John Mann, chartered accountant, of Glasgow and London.