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Some Measurements of Atmospheric Turbulence. By Lewis F. Richardson. Pp 28; 1 Plate. 
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On a Theory of the Second Order Longitudinal Spherical Aberration for a Symmetrical Optical 
System. By T. Y. Baker, B.A., Instructor Commander, R.N., and L. N. G. Filon, M.A., 
D.Sc., F R.S., Goldsmid Professor of Applied Mathematics and Mechanics in the University 
of London. Pp. 43. Price 3s. 6 d. 
Investigations on Lightning Discharges and on the Electric Field of Thunderstorms. By 
C. T. R. Wilson, F.R.S., Reader in Electrical Meteorology in the University of Cambridge 
and Observer in Meteorological Physics at the Solar Physics Observatory, Cambridge. 
Pp. 43 ; 4 Plates. Price 5s. 
Researches on the Elastic Properties and the Plastic Extension of Metals. By W. E. Dalbv, 
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The Stress-Strain Properties of Nitro-Cellulose and the Law of its Optical Behaviour. By 
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The Phenomena of Rupture and Flow in Solids. By A. A. Griffith, M. Eng. (of the Royal 
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Reduction of Error by Linear Compounding. By W. F. Sheppard, Sc.D., LL.M. Pp. 39. 
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Tidal Friction in Shallow Seas. By Harold Jeffreys, M.A., D.Sc., Fellow of St. John’s 
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Plane Stress and Plane Strain in Bipolar Co-ordinates. By G. B. Jeffery, M.A., D.Sc., Fellow 
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On the Structure of Lysorophus, as Exposed by Serial Sections. By W. J. Sollas, Sc.D., 
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Title, Contents, Index, &c., Yol. 209. Pp. 10. Price 6 d. 
Volume 209 (1920), 530 pp., with 70 Plates, Price £3 13s. 
The Respiratory Exchange of Man During and After Muscular Exercise. By J. M. H. Campbell, 
O.B.E., B.M., C. Gordon Douglas, C.M.G., M.C., D.M., Fellow of St. John's College, Oxford, 
and F. G. Hobson, D.S.O., B.M. Pp. 47. Price 5s. 
The Microscopical Features of Mechanical Strains in Timber and the Bearing of these on the 
Structure of the Cell-wall in Plants. By Wilfrid Robinson, D.Sc., Lecturer in Botany, 
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On a Form of Botrytis cinerea, with Colourless Sclerotia. By William B. Brierley (Roth- 
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The Irish Eskers. By J. W. Gregory, D.Sc., F.R.S. Pp. 37. Price 4s. 
The Thermo-Elastic Properties of Muscle. By A. V. Hill, F.R.S., and W. Hartree. Pp. 21. 
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The Blood Vascular System of the Tuatara, Sphenodon Pwictatus. By Chas. H. O’Donoghue, 
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