CONTENTS. 
IX 
Note on the Atomicity of Sulphur. By Dr Alexander Crum 
Brown, ....... 513 
Note on a paper by Balfour Stewart, Esq., in the Transactions of 
the Royal Society of Edinburgh, by I. Todhunter, Esq., M.A., 
St John’s College, Cambridge. Communicated by Professor Tait, 517 
Additional Observations on the Polarisation of the Atmosphere 
made at St Andrews in 1841, 1842, 1843, 1844, and 1845. By 
Sir David Brewster, K.H., D.C.L., F.R.S., &c., . . 520 
Notices of some Ancient Sculptures on the Walls of Caves in Fife. 
By Professor J. Y. Simpson, . . . . .521 
Observations on New Lichens and Fungi from Otago, New Zea- 
land. By Dr Lauder Lindsay, .... 527 
Orthogonal Isothermal Surfaces. By Professor Tait, . . 528 
Notes for a Comparison of the Glaciation of the West of Scotland 
with that of Arctic Norway. By Archibald Geikle, Esq., F.R.S., 530 
On the Third Co-ordinate Branch of the Higher Calculus. By 
Edward Sang, Esq., ...... 556 
On the Laws of the Fertility of Women. By J. Matthews Duncan, 
MD., . ..... 559 
On the Classification of Chemical Substances by Means of Generic 
Radicals. By Dr Alexander Crum Brown, . . . 561 
Note on the Compression of Air in an Air-bubble under Water. 
By Professor Tait, ...... 563 
On some Geometrical Constructions connected with the Elliptic 
Motion of Unresisted Projectiles. By Professor Tait, . . 565 
On the Fairy Stones found in the Elwand Water, near Melrose. 
By Sir David Brewster, K.H., F.R.S., . . 567 
Report on the Hourly Observations made at Leith Fort in 1826 and 
1827, by Direction of the Society. By Sir David Brewster, 
K.H., D.C.L., F.R.S., &c, . . . . .573 
On a New Property of the Retina. By Sir David Brewster, K.FI., 
D.C.L., F.R.S., «&c., . . . . ,573 
On some Laws of the Sterility of Women. By J. Matthews 
Duncan, M.D., ...... 574 
On certain Points in the Morphology of Cleft Palate. By John 
Smith, M.D., F.R.C.S.E. Communicated by William Turner, 
M.B., . . . . . . .575 
Notes more especially on the Bridging Convolutions in the Brain of 
the Chimpanzee. By Wm. Turner, M.B., F.R.S.E., . .578 
On the Theory of the Refraction and Dispersion of Light. Part I. 
By Alfred R. Catton, M.A., F.R.S.E., Fellow of St John’s Col- 
lege, Cambridge, Assistant to the Professor of Natural Philoso- 
phy in the University of Edinburgh, . . . .587 
On the General Equation of Motion of a Heterogeneous Compres- 
sible System of Particles slightly Disturbed from their Position of 
Equilibrium. By A. R. Catton, M.A., . . . 590 
On some Capillary Phenomena. By Professor Tait, . . 593 
On Functions with Recurring Derivatives. By Edward Sang, Esq., 594 
The World as Governed by Law, Teleologically considered. By R. 
S. Wyld, Esq., ...... 596 
VOL- V. 
h 
