Sold by Dltlau and Co., 37, Soho Square, VV. 
EECENT PAPEES IN THE ‘PHILOSOPHICAL TRANSACTIONS,’ 
1902-1903, 
Series A.—Mathematical and Physical. 
A. 335. On the Vibrations and Stability of a Gravitating Planet. By J. H. Jeans, B.A., Isaac Newton 
Student, and Fellow of Trinity College, Cambridge. Price 1-5. 6d. 
A, 336. On the Formation of Definite Figui’es by the Deposition of Dust. By W. J. Russell, Ph.D., 
F.R.S. Price 2s. 6d. 
A. 337. The Spectrum of y Cygni. By Sir Norman Lockyer, K.C.B., F.R.S,, and F. E. Baxandall, 
A. R.C.Sc. Price 2s. 6 d. 
A, 338. Quaternions and Projective Geometry. By Professor Charles Jasper Joly, Royal 
Astronomer of Ireland. Price 5s. 
A. 339. The Differential Invariants of a Surface, and their Geometric Significance. By A. R. Forsyth, 
M.A., Sc.D., F.R.S., Sadlerian Professor of Pure Mathematics in the University of Cambridge. 
Price 3s. 
A. 340, On the Laws Governing Electric Discharges in Gases at Low Pressures. By W. R. Carr, B.A., 
Post-graduate Student, University of Toronto. Price 2s. 
A. 341. On the Dependence of the Refractive Index of Gases on Temperature. By George W. Walker, 
M.A., A.R.C.Sc., Fellow of Trinity College, Cambridge. Price Is. 6d. 
A. 342, Solar Eclipse of 1900, May 28.—General Discussion of Spectroscopic Results. By J. Evershed, 
F.R.A.S. Price 3.s. 
A. 343. The Electrical Conductivity Imparted to a Vacuum by Hot Conductors. By 0, W. Richardson, 
B. A., B.Sc., Fellow of Trinity College, Cambridge. Price 3s. 6d 
Series B. — Biological. 
B. 209. The Pharmacology of Pyraeonitine and Methylbenzaeonine considered in Relation to their 
Chemical Constitution. By J. Theodore Cash, M.D., F.R.S., Regius Professor of Materia 
Medica in the University of Aberdeen, and Wyndham R. Dunstan, M.A., F.R.S., Director 
of the Scientific and Technical Department of the Imperial Institute. Price Is. 
B. 210. The Structure and Development of the Stem in the Pteridophyta and Gymnosperms. By 
Edward C. Jeffrey, Ph.D. (Harvard). Price 3s. 
B. 211 . On the Structure of the Gills of the Lamellibranchia. By W. G. Ridewood, D.Sc., F.L.S., 
Lecturer on Biology at the Medical School of St. Mary’s Hospital, London. Price 9s. 6d. 
B. 212. The Development of Echinus Esculentus, together with some Points in the Development of 
E. Miliaris and E. Acutus. By E. W. MacBride, M.A., D.Sc. (Lond.), sometime Fellow of 
St. John’s College, Cambridge; Strathcona Professor of Zoology in the McGill Universit 3 % 
Montreal. Price 8s. Qd. 
B. 213. Title, Contents, Index, t^c., Vol. 195. Price Qd. 
B. 214. The Seed-Fungus of Loliurn I'emulentim, L., the Darnel. By E. M. Freeman, M.S., University 
of Minnesota. Price 3s. 
B, 215. On the Histology of Uredo disperse, Erikss., and the “Mycoplasm” Hypothesis. By 
H. Marshall AVard, Sc.D., F.R.S., Professor of Botany in the University of Cambridge 
Price 3s, 
B. 216. The (Estrous Cycle and the Formation of the Corpus Luteum in the Sheep, By Francis H. A. 
Marshall, B.A. Price 4s. 
B. 217. On the Evolution of the Proboscidea. By C. W, Andrews, D.Sc., F.G.S., British Museum 
(Natural History). Price l.s. 
Cloth cases for binding the ‘ Philosophical Transactions ’ can be obtained of Harrison and Sons, 
St. Martin’s Lane. Price Is. Qd. 
