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RECENT PAPERS IN THE ‘PHILOSOPHICAL TRANSACTIONS,’ 
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A 539. The Electrical Conductivity and Luminosity of Flames Containing Salt Vapours. By H. A. 
Wilson, F.B.S., Professor of Physics, Rice Institute, Houston, Texas, U.S.A. Pp. 28. 
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A 540. The Threshold of Vision for Different Coloured Lights. By Sir W. de W. Abney, K.C.B., 
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A 541. On Certain Linear Differential Equations of Astronomical Interest. By Prof. H. F. Baker, 
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A 542. Discussion of Kew Magnetic Data, especially the Diurnal Inequalities of Horizontal Force and 
Vertical Force, from Ordinary Days of the Eleven Years 1890 to 1900. By C. Chree, Sc.D., 
LL.D., F.R.S., Superintendent, Kew Observatory. Pp. 91. Price 5s. 
A 543. On the Law of Distribution of Molecular Velocities, and on the Theory of Viscosity and Thermal 
Conduction, in a Non-uniform Simple Monatomic Gas. By S. Chapman, M.A., D.Sc., Fellow 
and Lecturer of Trinity College, Cambridge. Pp. 70. Price 3s. 6 d. 
A 544. The Newtonian Constant of Gravitation as Affected by Temperature. By P. E. Shaw, B.A., 
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A 545. The Combining Volumes of Hydrogen and Oxygen. By F. P. Burt, D.Sc., and E. C. Edgar, 
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A 546. Mathematical Contributions to the Theory of Evolution. XIX.—Second Supplement to a 
Memoir on Skew Variation. By Karl Pearson, F.R.S. Pp. 29 : 1 Plate. Price Is. 6 d. 
Series B. — Biological. 
B 339. The Measurement of the Rate of Heat-Loss at Body Temperature by Convection, Radiation, and 
Evaporation. By Leonard Hill, F.R.S., O. W. Griffith, and Martin Flack. (From 
the Department of Applied Physiology, Medical Research Committee). Pp. 38. Price 3s. 
B 340. The Spread of the Excitatory Process in the Vertebrate Heart. Parts I.-V. By Thomas Lewis. 
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B 341. The Monotreme Skull: A Contribution to Mammalian Morphogenesis. By D. M. S. Watson, 
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B 342. Observations on Coprozoic Flagellates : together with a Suggestion as to the Significance of the 
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B 343. On the Relation between Transpiration and Stomatal Aperture. By Sir Francis Darwin, 
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B 344. On the Structure and Development of the Skull and Laryngeal Cartilages of Perameles, with 
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B 345. The Electrical Conductivity of Echinoderm Eggs, and its Bearing on the Problems of Fertilisation 
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B 346. On the Structure of the Dicynodont Skull. By Igerna B. J. Sollas and W. J. Sollas, F.R.S. 
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