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RECENT PAPERS IN THE ‘PHILOSOPHICAL TRANSACTIONS/ 
1906-1907. 
Series A .— Mathematical and Physical. 
A 417. The Gravitational Stability of the Earth. By A. E. H. Love, F.R.S., Sedleian Professor of 
Natural Philosophy in the University of Oxford. Pp. 71. Price 3 s. 
A 418. Investigation of the Law of Burning of Modified Cordite. By Major J. H. Mansell, Royal 
Artillery. Pp. 20. Price Is. 6 d. 
A 419. On the Dispersion in Artificial Double Refraction. By L. N. G. Filon, M.A., D.Sc., Fellow 
and Lecturer in Mathematics of University College, London. Pp. 44. Price 2s. fid. 
A 420. The Distribution of Blue-Violet Light in the Solar Corona on August 30, 1905, as derived from 
Photographs taken at Kalaa-es-Senam, Tunisia. By L. Becker, Ph.D., Regius Professor of 
Astronomy in the University of Glasgow. Pp. 33; 1 Plate. Price 2s. 
A 421. On the Surface-Tension of Liquids Investigated by the Method of Jet Vibration. By 
P. O. Pedersen. Pp. 52; 3 Plates. Price 3s. 
A 422. The Normal Weston Cadmium Cell. By F. E. Smith, A.R.C.Se. (from the National Physical 
Laboratory). Pp. 28 ; 1 Plate. Price 2s. 
A 423. Electric Furnace Reactions under Hi°h Gaseous Pressures Bv R. S. Hutton and J. E. Petavel. 
o «/ 
Pp. 42; 1 Plate. Price 2s. 6 d. 
A 424. A New Current Weigher and a Determination of the Electromotive Force of the Normal Weston 
Cadmium Cell. By W. E. Ayrton, F.R.S., and T. Mather, F.R.S., Central Technical 
College, London, and F. E. Smith, A.R.C.Se. (National Physical Laboratory, Teddington). 
Pp. 82; 2 Plates. Price 5s. 
A 425. The Silver Voltameter. Part I.—By F. E. Smith, A.R.C.Se., and T. Mather, F.R.S. Part II. 
— By F. E. Smith, A.R.C.Se., and T. M. Lowry, D.Sc-. Pp. 55; 1 Plate. Price 3s. 
A 426. Title, Contents, Index, Ac., Vol. 207. Pp. 10. Price 6(7. 
Series B .— Biological. 
Observations on the Development of Ornitkorhynchus. By J. T. Wilson, M.B., Professor of 
Anatomy, University of Sydney, N.S.W., and J. P. Hill, D.Sc., Professor of Zoology, 
University College, University of London. Pp. 138; 17 Plates. Price 10s. 6 cl. 
On the Julianiacese : A New Natural Order of Plants. By W. Botting Hemsley, F.R.S., F.L.S., 
Keeper of the Herbarium and Library, Royal Botanic Gardens, Kew. Pp. 29; 7 Plates. 
Price 3s. 6<7. 
Studies on the Development of Larval Nephridia. Part II.—Polygordius. By Gresswei.u 
Shearer, B.A., M.D., C.M., Trinity College, Cambridge. Pp. 32; 4 Plates. Price 4s. 
Cases of Colour-blindness, No. VI. to No. XVIII., together with Eleven Selected Examples or 
Normal Colour Sensations. By George J. Bl t rch, M.A., D.Sc. Oxon, F.R.S., Lecturer in 
Physics, University College, Reading. Pp. 21. Price Is. 
The of the Various Elements in the Development and Regeneration of Bone. By Sir 
William Macewen, F.R.S. Pp. 27. Price 2s. 
On the Cranial and Facial Characters of the Neandertal Race. By W. J. Sole as, Sc.D., LL.D., 
F.R.S., Professor of Geology in the University of Oxford. Pp. 59; 1 Plate. Price 5s. 
The Ascent of Water in Trees. By A. J. Ewart, D.Sc., Ph.D., F.L.S., Government Botanist and 
Professor of Botany in Melbourne University. Pp. 52; 1 Plate. Price 3s. 
On the Skull, Mandible, and Milk Dentition of Pakeomastodon, with some Remarks on the Tooth 
Change in the Proboseidea in General. By C. W. Andrews, D.Sc., F.R.S. (British Museum, 
Natural History). Pp. 15; 2 Plates. Price 2s. 6(7 
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