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On the Soaring of Birds : being a Communication from Mr R. E. Froude in • 
continuation of the Extract from a Letter by the late Mr William Froude 
to Sir William Thomson, published in these “Proceedings,” March 19, 
1888, . . . . . . . .65 
On some hitherto unproved Theorems in Determinants. By Thomas Muir, 
LL.D., ......... 73 
x n y n 
Equation of the Glissette of the Two-term Oval ^ — 1 > an( l Cognate Curves. 
By the Hon. Lord McLaren, . . . . . . .83 
The Influence of High Winds on the Barometer at the Ben Nevis Observatory. 
By Alexander Buchan, LL.D., ...... 88 
Electrolytic Synthesis of Dibasic Acids'. Alkyl Derivatives of Succinic Acid. 
By Professor Crum Brown and Dr James Walker, . '. .95 
Proposed Extension of the Powers of Quaternion Differentiation. By Alex- 
ander M‘Aul ay, Ormond College, Melbourne. Communicated by Professor 
Tait, . . . . . . . ... 98 
On the Interaction of Longitudinal and Circular Magnetisations in Iron and 
Nickel Wires. (Second Note.) By Professor Cargill G. Knott, . .124 
On the Composition of some Deep-Sea Deposits from the Mediterranean. By 
J. Y. Buchanan, F.R.S., ....... 131 
On the Temperature of the Salt and Fresh Water Lochs of the West of Scotland, 
at Different Depths and Seasons, during the Years 1887 and 1888. By 
John Murray, LL.D., Ph.D., . . . . . . 139 
On Silica and the Siliceous Remains of Organisms in Modern Seas. By J ohn 
Murray, LL.D., Ph.D.* &c., and Robert Irvine, F.O.S., . . . 229 
A New Method for the Estimating the Specific Gravity of the Blood. By John 
Berry Haycraft, M.D., D.Sc., ...... 251 
On the Estimation of Uric Acid in the Urine. A Reply to Criticisms upon the 
Silver Method. By John Berry Haycraft, M.D., D.Sc., . . : 255 
On a Method of Observing and Counting the Number of Water Particles in a 
Fog. By John Aitken, F.R.S., . . . . . 259 
On an Optical Proof of the Existence of Suspended Matter in Flames. By Sir 
G. G. Stokes, Bart., F.R.S. (In a letter to Professor Tait), . . 263 
Note on the Isothermals of Ethyl Oxide. By Professor Tait, . . . 265 
