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RECENT PAPERS IN THE ‘PHILOSOPHICAL TRANSACTIONS/ 
1914. 
Series A.—Mathematical and Physical. 
A 506. A Method of Measuring the Pressure Produced in the Detonation of High Explosives or by the 
Impact of Bullets. By Bertram Hopkinson, F.RS. Pp. 20. Price Is. 6d. 
A 507. Gravitational Instability and the Nebular Hypothesis. By J. H. Jeans, M.A., F.RS. Pp. 29. 
Price Is. 6 d. 
A 508. Title, Contents, Index, &c., Yol. 213. Pp. 8. Price 6 d. 
A 509. The Preparation of Eye-preserving Glass for Spectacles. By Sir William Crookes, O.M., F.RS. 
Pp. 25. Price Is. 6d. 
A 510. Absolute Measurements of a Resistance by a Method Based on that of Lorenz. By F. E. 
Smith, AR.C.Sc. (From the National Physical Laboratory.) Pp. 82. Price 4s. 6 d. 
A 511. The Influence of Molecular Constitution and Temperature of Magnetic Susceptibility. By 
A. E. Oxley, B.A., M.Sc., Coutts Trotter Student, Trinity College, Cambridge. Pp. 38. 
Price 3s. 
A 512. A Determination of the Electromotive Force of the Weston Normal Cell in Semi-absolute Volts. 
By A. Norman Shaw, M.Sc., 1851 Exhibitioner, and King Research Fellow, McGill 
University, Montreal. With a Preface by Prof. H. L. Callendar, F.R.S. Pp. 52; 2 Plates. 
Price 3s. 
A 513. Similarity of Motion in Relation to the Surface Friction of Fluids. By T. E. STANTON and 
J. R. Pannell. (From the National Physical Laboratory.) Pp. 26. Price 2s. 
A 514. Bakerian Lecture. —Series Lines in Spark Spectra. By A. Fowler, F.R.S., Assistant Pro¬ 
fessor of Physics, Imperial College, South Kensington. Pp. 42; 1 Plate. Price 2s. 6 d. 
Series B. — Biological. 
Experiments on the Restoration of Paralysed Muscles by Means of Nerve Anastomosis. By 
Robert Kennedy, M.A., D.Sc., M.D., St. Mungo Professor of Surgery in the University of 
Glasgow. Pp. 50; 2 Plates. Price 3s. 
Some Notes on Soil Protozoa. By C. H. Martin, M.A., and K. R. Lewin, B.A., Rothamsted 
Experimental Station. Pp. 18; 2 Plates. Price 3s. 
On the Process of Calcification in Enamel and Dentine. By J. Howard Mummery, M.R.C.S., 
L.D.S. Pp. 19; 2 Plates. Price 2s. 
On the Floral Mechanism of Welswitchia mimbilis (Hooker). By A. H. Church, M.A., D.Sc., 
Lecturer in Botany, University of Oxford. Pp. 37; 5 Plates. Price 3s. 6 d. 
The Chromafiine System of Annelids and the Relation of this System to the Contractile Vascular 
System in the Leech, Hirudo medicinalis. A Contribution to the Comparative Physiology of 
the Contractile Vascular System and its Regulators, the Adrenalin Secreting System and the 
Sympathetic Nervous System. By J. F. Gaskell, M.A., M.D., F.R.C.P., D.P.H., Beit 
Memorial Research Fellow. Pp. 59 ; 4 Plates. Price 6s. 
The Development and Certain Points in the Adult Structure of the Starfish, Asterias rubens, L. 
By James F. Gemmill, M.A., D.Sc., Lecturer in Embryology at Glasgow University, and in 
Zoology at Glasgow Provincial Training College. Pp. 82; 7 Plates. Price 5s. 6 d. 
On the Nature of the Tubes in Marsupial Enamel, and its Bearing upon Enamel Development. 
By J. Howard Mummery. Pp. 19; 2 Plates. Price 2s. 6 d. 
On Fossil Plants, showing Structure, from the Base of the Waverley Shale of Kentucky. By 
D. H. Scott, For. Sec. R.S., and E. C. Jeffrey, Ph.D., Professor of Plant Morphology in 
Harvard University. Pp. 59; 13 Plates. Price 7s. 6 d. 
Cloth cases for binding the ‘ Philosophical Transactions ’ can be obtained of Harrison and Sons, 
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