Contents . 
vii 
PAGE 
Demonstrations of Theorems A, B. C, &c., page 484 of Transactions , 
Royal Society of Edinburgh, vol. xxxii. By Rev, T. P. Kirkman, 
M.A., F.R.S., . . . . . . .359 
On the Twists of Listing and Tait. By the Rev. T. P. Kirkman, 
M.A., F.R.S., . . . . . . .363 
Election of Office-Bearers, ...... 369 
On the Motion of a Liquid within an Ellipsoidal Hollow. By Sir 
William Thomson, . . . . . . .370 
The Sacral Index in Various Races of Mankind. By Professor Sir 
Wm. Turner, M.B., F.R.S., 378 
On a Case of Interlacing Surfaces. By Professor Crum Brown, . 382 
On the Foundations of the Kinetic Theory of Gases. By Professor 
Tait, . . . . . . . . .386 
On the Distribution of Temperature in Loch Lomond during the 
Autumn of 1885. By J. Y. Buchanan, F.R.S.E. (Plate XI.), . 403 
On Oceanic Shoals discovered in the s.s. “ Dacia ” in October 1883. 
By Mr J. Y. Buchanan. (Plate XII.), .... 428 
On the Phytogeny of the Tunicata. By W. A. Herdman, D.Sc., F.L.S., 
Professor of Natural History in University College, Liverpool, . 444 
On Dew. By Mr John Aitken, ..... 446 
Observations on the Structure of Lumbricus complanatus , Duges. 
By Frank E. Beddard, M.A., F.Z.S., Prosector to the Zoological 
Society of London, . . . . . . .451 
On the Physical Conditions of Rivers entering a Tidal Sea ; from 
Observations on the Spey. By Hugh Robert Mill, B.Sc., and T. 
Morton Ritchie, B.Sc. (Plates XIII., XIV., XV.), . . 460 
The Distribution and Significance of Micro-Organisms in Water. 
By Mr A. Wynter Blyth, . . . . . .485 
Notes on Experiments for the Board of Trade, made at the South 
Foreland Lighthouse by the Trinity House of London on Light- 
house Illuminants, &c. By Thomas Stevenson, Pres. R.S.E., 
M.Inst.C.E., ........ 494 
Glories, Halos, and Coronse seen from Ben Nevis Observatory. 
Extracts from Log Book. By Mr R. T. Omond. Communicated 
by Professor Tait. (Plate XVI.), ..... 500 
On a Model of the “ Half-Twist Surface.” By Professor Crum 
Brown. (Plate XVII.), .513 
On the Linear Section PR of a Knot M„, which passes through two 
Crossings P and R, which meets no Edge, and which cuts away a 
(3 + r)-gonal Mesh of M w . By Rev. Thomas P. Kirkman, M. A., 
F.R.S., . . . ' 514 
Experiments on the Field of a Helmholtz Tangent Galvanometer. 
By Messrs R. Ellis, C.E. ; R. D. Clarkson ; and H. Rainy, M.A. 
(Plate XVIII.), 523 
