PROCEEDINGS 
OF TIIE 
ROYAL SOCIETY OE EDINBURGH 
SESSION 1885-86. 
rjuL 
.0 
CONTENTS. 
GeneYat Statutory Meeting , Monday , 23 rd November 1885. 
Election i)f Office-Bearers, . . . ; 
Monday , 7 th December 1885. 
On the Motion of a Liquid within an Ellipsoidal Hollow. By Sir William 
Thomson, ......... 
The Sacral Index in Various Races of Mankind. By Professor Sir William 
Turner, M.B., F.R.S., ....... 
On a Case of Interlacing Surfaces. By Professor Crum Brown, 
On the Foundations of the Kinetic Theory of Gases. By Professor Tait, 
Monday , 21 st December 1885. 
On the Distribution of Temperature in Loch Lomond during the Autumn of 
1885. By J. Y. Buchanan, F.R.S.E. (Plate XI.), 
On Oceanic Shoals discovered in the s.s. “ Dacia ” in October 1883. By Mr 
J. Y. Buchanan. (Plate XII.), ...... 
On the Phylogeny of the Tunicata. By W. A. Herdman, D.Sc., F.L.S., Pro- 
fessor of Natural History in University College, Liverpool, 
On Dew. By Mr John Aitken, ...;.. 
Observations on the Structure of L'uvnbricus complanatus, Duges. By Frank 
E. Beddard, M.A., F.Z.S., Prosector to the Zoological Society of London, 
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.), . . . . ! 
. The Distribution and Significance of Micro-Organisms in Water. By Mr A. 
Wynter Blyth, ........ 
Monday, 4th January 1886. 
Notes on Experiments for the Board of Trade, made at the South Foreland 
Lighthouse by the Trinity House of London, on Lighthouse Illuminants, 
&c. By Thomas Stevenson, Pres. R.S.E., M. Inst. C.E., . 
Glories, Halos, and Coronse seen from Ben Nevis Observatory. Extracts from 
Log Book. By Mr R. T. Omond. Communicated by Professor Tait. 
(Plate XVI.), 
On a Model of the “ Half-Twist Surface.” By Professor Crum Brown. 
(Plate XVII.), 
On the Linear Section PR of a Knot M m , which passes through two Crossings P 
and R, which meets no Edge, and which cuts away a (3 + r)-gonal Mesh of 
M n . By Rev. Thomas P. Kirkman, M.A., F.R.S., 
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.), 
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