Sold by Dulau and Co., 37, Soho Square, W. 
RECENT PAPERS IN THE ‘PHILOSOPHICAL TRANSACTIONS.’ 
1902-1903. 
A. 335. 
A. 336. 
A. 337. 
A. 338. 
A. 339. 
A. 340. 
A. 341. 
A. 342. 
A. 343. 
A. 344. 
Series A.—Mathematical and Physical. 
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 Is. &d. 
On the Formation of Definite Figures by the Deposition of Dust. By AV. J. Bussell, Ph.D., 
F.R.S. Price 2s. Qd. 
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. <6d. 
Quaternions and Projective Geometry. By Professor Charles Jasper Joey, Royal 
Astronomer of Ireland. Price 5s. 
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. M. 
On the Laws Governing Electric Discharges in Gases at Low Pressures. By AV. R. Carr, L.A., 
Post-graduate Student, University of Toronto. Price 2s. 
On the Dependence of the Refractive Index of Gases on Temperature. By George AV. AA^alker, 
ALA., A.R.C.SC., Fellow of Trinity College, Cambridge. Price Ls. U. 
Solar Eclipse of 1900, Alay 28.—General Discussion of Spectroscopic Results. By J. Evershed, 
F R A S Price 3s. 
The Electrical Conductivity Imparted to a Vacuum by Hot Conductors. By 0. AV. Richardson, 
B. A., B.Sc., Fellow of Trinity College, Cambridge. Price 3s. 6fZ. 
On the Formation of Definite Figures by the Deposition of Dust. By John Aitken, F,R.S. 
Price I s. 
Series B. — Biological. 
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 AV. G. Ridewood, D.Sc., F.L.S., 
Lecturer on Biology at the Medical School of St. Mary’s Hospital, London. Price 9s. U. 
B 212 The Development of Echinus Esculentus, together with some Points in the Development of 
E. Miliaris and E. Acutus. By E. AV. MacBride, M.A., D.Sc. (Lond.), sometime Fellow of 
St. John’s College, Cambridge; Strathcona Professor of Zoology in the AIcGill University, 
Alontreal. Price 8s. Qd. 
B. 213. Title, Contents, Index, &c., Vol. 195. Price Qd. 
B. 214. The Seed-Fungus of Lolium Temvlentum, L., the Darnel. By E. M. Freeman, M.S., University 
of Alinnesota. Price 3s. 
B 215 On the Histology of Uredo dispersa, Erikss., and the “ Alycoplasm Hypothesis. By 
H. Marshall AAL^rd, Sc.D., F.R.S., Professor of Botany in the University of Cambridge. 
Price 3s. , tr a 
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. AV. Andrews, D.Sc., I.G.S., British Aluseum 
(Natural History). Price Ls. 
Cloth cases for binding the ‘ Philosophical Transactions ’ can be obtained of Harrison and Sons, 
St. Martin’s Lane, Price Is. ^d. 
