Introduction to the Hydrodynamics of Porous Bodies . By S T I. G HEORGHITA . Academic edition of the Rumanian Socialist Republic, 1969. 2l0pp. Clear Air Turbulence . By N. K. V INNICHENKO , N. Z. P INUS , S. M. S HMETER and G. N. S HUR . Hydrometeorological Publishing House, 1968. 336pp. Dynamics of Elastic Containers Partially Filled with Liquid . By I. M. R APOPORT . Translated from the Russian by Scripta Technica Inc. Springer Verlag, 1968. 368pp. $14.80. Directory of Fire Research in the United States, 1965-1967 . Publication 1590 of the National Academy of Sciences, 1968. 267pp. $7.00. Thermodynamic Tables in S.I. (Metric) Units . By R. W. H AYWOOD . Cambridge University Press, 1968. 42 pp. 12 s . Proceedings of the Summer Seminar in Fluid Mechanics . Edited by P. L. B HATNAGAR . Nallaris Printers, Bangalore, 1968. 482pp. 45s. or $6.00. Proceedings of the 16th Japan National Congress for Applied Mechanics 1966 . Central Scientific Publishers, Tokyo. 375 pp. Numerical Methods in Engineering, Volume I, No. 1 . Edited by 0. C. Z IENKIEWICZ and R. H. G ALLAGHER . John Wiley, 1969. 133pp.