THIS new journal is intended to provide a medium for the publication of papers on classical mechanics and mathematical techniques. The first number, dated March 1948, which has recently been issued, contains papers by D. C. Pack, R. Hill, D. R. Hartree and S. Johnston, W. G. Bickley, S. Goldstein, A. D. Young, M. J. Lighthill, and Sir Geoffrey Taylor. Rather more than half of these papers deal with hydrodynamics and its applications to aerodynamics or internal ballistics ; the others deal with elasticity or methods and results useful in computation. The editors are Prof. G. C. McVittie and Prof. V. C. A. Ferraro, assisted by an editorial board which includes most of the leading British applied mathematicians. The publishers are the Oxford University Press, and the subscription is £2 a year for the four numbers.