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EECENT PAPERS IN THE ‘PHILOSOPHICAL TRANSACTIONS,’ 
1905-1906. 
Series A.—Mathematical and Physical. 
A. 396. Modified Apparatus for the Measurement of Colour and its Application to the Determination of 
the Colour Sensations. By Sir William de W. Abney, K.C.B., F.R.S. Pp. 23. Price Is. 
A. 397. The Pressure of Explosions.—Experiments on Solid and Gaseous Explosives. Parts I. and II. 
By J. E. Petavel. Pp. 42; 1 Plate. Price 2s. 6 d. 
A. 398. Fifth and Sixth Catalogues of the Comparative Brightness of the Stars—in Continuation of 
those Printed in the ‘Philosophical Transactions of the Royal Society’ for 1796-99. By 
Dr. Heeschel, LL.D., F.R.S., Prepared for Press from the Original MS. Becords by 
Col. J. Herschel, RE., F.R.S. Pp. 49. Price 2s. 
A. 399. On the Accurate Measurement of Ionic Velocities, with Applications to Various Ions. By 
R B. Denison, M.Sc., Ph.D., and B. D. Steele, D.Sc. Pp. 16. Price Is. 
A. 400. On Mathematical Concepts of the Material World. By A. N. Whitehead, Sc-.D., F.R.S., 
Fellow of Trinity College, Cambridge. Pp. 61. Price 2s. 6 cl . 
A. 401. Title, Contents, Index, &c., Vol. 205. Pp. 10. Price 6 d. 
A. 402. The Combination of Hydrogen and Oxygen in Contact with Hot Surfaces. By William 
Arthur Bone, Ph.D., D.Sc., F.RS., late Bishop Berkeley Fellow of Owens College, 
Manchester, and Fellow of Victoria University, and Richard Vernon Wheeler, B.Sc., 
Dalton Scholar and Fellow of Manchester University. Pp. 67. Price 3s. 
A. 403. On the Periodicities of Sunspots. By Arthur Schuster, F.R.S. Pp. 32. Price Is. 6 d. 
Screes B. — Biological. 
B. 240. On the Structure and Affinities of Fossil Plants from the Palaeozoic Rocks. V. On a New Type 
of Sphenophyllaceous Cone (Splienophyllwn Fertile) from the Lower Coal-Measures. By 
D. H. Scott, M.A., Ph.D., F.R.S., Honorary Keeper of the Jodrell Laboratory, Royal Botanic- 
Gardens, Kew. Pp. 23; 3 Plates. Price 2s. 6 d. 
B. 241. The Ascent of Water in Trees. By Alfred J. Ewart, D.Sc., Ph.D., F.L.S., Lecturer on 
Botany in the Birmingham University, and in the Birmingham Municipal Technical School. 
Pp. 45. Price 2s. 
B. 242. On Endophytic Adaptation shown by Erysiplie graminis DC. under Cultural Conditions. By 
Ernest S. Salmon, F.L.S. Pp. 11 • 1 Plate. Price Is. 
B. 243. Contributions to the Physiology of Mammalian Reproduction.—Part I. The CEstrous Cycle in 
the Dog. Part II. The Ovary as an Organ of Internal Secretion. By Francis H. A. 
Marshall, Carnegie Fellow in the University of Edinburgh; and William A. Jolly, 
Assistant to the Professor of Physiology in the University of Edinburgh. Pp. 43; 2 Plates. 
Price 5s. 
B. 244. The Morphology of the Ungulate Placenta, particularly the Development of that Organ in the 
Sheep, and Notes upon the Placenta of the Elephant and Hyrax. By Richard Assheton, 
M.A., Lecturer on Biology in the Medical School of Guy’s Hospital, University of London. 
Pp. 78; 5 Plates. Price 7s. 6 d. 
B. 245. Further Experiments and Histological Investigations on Intumescences, with some Observations 
on Nuclear Division in Pathological Tissues. By Miss E. Dale. Pp. 43 ; 4 Plates. Price 4s. 
B. 246. Some Observations on TFelwitschia Mirabilis , Hooker,/. By H. H. W. Pearson, M.A., F.L.S., 
Professor of Botany in the South African College, Capetown; sometime Scholar of Christ’s 
College, Frank Smart Student of Gonville and Caius College, Cambridge, and Assistant in the 
Royal Gardens, Kew. Pp. 40; 5 Plates. Price 4s. Qd. 
Cloth cases for binding the ‘ Philosophical Transactions ’ can be obtained of Harrison and Sons, 
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