CONTENTS. 
PAGE 
Election of Office-Bearers, . . . . . .1 
Chairman’s Opening Address, . . . . .2 
The Jubilee Prize, . . . . . . .9 
Proposed Additions to the List of Honorary Fellows, . .10 
The Edinburgh Equatorial in 1887 ; a Paper with two Appendices. 
By C. Piazzi Smyth, Esq., Astro nomer-Koyal for Scotland, . 11 
On Cauchy’s and Green’s Doctrine of Extraneous Force to explain 
dynamically Fresnel’s Kinematics of Double Kefraction. By Sir 
W. Thomson, . . . . . . .21 
On the Minimal Tetrakaidekahedron, with Exhibition of Models. 
By the President, . . . . . . .33 
Kesearches on Micro-Organisms, including ideas of a new Method 
for their Destruction in certain cases of Contagious Diseases. 
Part II. By Dr A. B. Griffiths, F.E.S. Edin., . . .33 
On the Colour of the Skin of Men and Animals in India. By Robert 
Wallace, Esq., Professor of Agriculture and Rural Economy in the 
University of Edinburgh, . . . . . .64 
On the Height and Volume of the Dry Land, and the Depth and 
Volume of the Ocean. By Dr John Murray, . . .65 
The Pineal Body {Epiphysis cerebri) in the Brains of the Walrus and 
Seals. By Professor Sir William Turner, M.B., LL.D., F.R.S., . 65 
On a Method of graphically recording the Exact Time Relations of 
Cardiac Sounds and Murmurs. By Byrom Bramwell, M.D., and 
R. Milne Murray, M.B., . . . . . .66 
On Benzyl Phosphines. By Professor E. A. Letts and W. Wheeler, 
Esq., . . . . . . . .66 
A Criticism of the Theory of Subsidence as explaining the Origin of 
Coral Reefs. By H. B. Guppy, M.B., R.N. Communicated by 
Dr H. Mill, 84 
On the Compressibility of Water and of Different Solutions of 
Common Salt. By Professor Tait, . ... .84 
On a Practical Constant- Volume Air Thermometer. By J. T. 
Bottomley, Esq., . . . . . . .85 
