THE death has been announced, at the early age of fifty-four, of Prof. John Gordon Longbottom, of the Royal Technical College, Glasgow, which occurred on June 6 after a serious operation. Prof. Longbottom was a native of Keighley, Yorkshire, and served his apprenticeship in engineering in the works of Messrs. F. and J. Butterfield. His technical education was received at the Bradford Technical College, and a Whit-worth Scholarship enabled him to proceed to the Royal College of Science and University College, London, where he became an assistant to Prof. Karl Pearson. About twenty-eight years ago he joined the staff of the Ro ya Technical College, Glasgow, and became professor of mechanics on the retirement of the late Prof. Rowden. Prof. Longbottom was very retiring, and consequently his abilities were not widely known outside the College. His mathematical knowledge and his power of applying it to practical problems were of great advantage to his students, who will remember him not only for the soundness of his work, but also for the kindliness of his disposition. His appointment was made prior to the erection of the new buildings of the College, and he was therefore responsible for the equipment of the Materials Laboratory-an installation which is Worthy of the College. He was a member of the Institution of Mechanical Engineers and of the Institution of Engineers and Shipbuilders in Scotland; he contributed to the latter Institution a paper on the stresses on the rim and arms of a flywheel.