iv Contents. 
Proposed Extension of the Powers of Quaternion Differentiation. 
By Alexander M‘Aulay, Ormond College, Melbourne. Com- 
municated by Professor Tait, ..... 
On the Interaction of Longitudinal and Circular Magnetisations in 
Iron and Nickel Wires. (Second Note.) By Professor Cargill 
G. Knott, ...... 
On the Composition of some Deep-Sea Deposits from the Medi- 
terranean. By J. Y. Buchanan, F.B.S., .... 
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., 
On Silica and the Siliceous Remains of Organisms in Modern 
Seas. By John Murray, LL.D., Ph.D., &c., and Robert Irvine, 
F.C.S., 
A New Method for the Estimating the Specific Gravity of the 
Blood. By John Berry Hay craft, M.D., D.Sc., . 
On the Estimation of Uric Acid in the Urine. A Reply to 
Criticisms upon the Silver Method. By John Berry Hay craft, 
M.D., D.Sc., . 
On a Method of Observing and Counting the Number of Water 
Particles in a Fog. By John Aitken, F.R.S., 
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), ....... 
Note on the Isothermals of Ethyl Oxide. By Professor Tait, 
Additional Observations on the Development and Life-Histories of 
the Marine Food-Fishes, and the Distribution of their Ova. By 
Professor W. C. M‘Intosh, F.R.S., .... 
A Case of Defective Endochondral Ossification in a Human Foetus 
(so-called Cretinoid). By Johnson Symington, M.D., and Henry 
Alexis Thomson, M.D. (With Three Plates), 
On the Blood of the Invertebrata. By Dr A. B. Griffiths, F.R.S.E., 
F.C.S., &c., 
A New Ship for the Study of the Sea. By His Serene Highness 
the Prince of Monaco, ...... 
The Electric Resistance of Cobalt at High Temperatures. By 
Professor Cargill G. Knott, D.Sc., F.R.S.E. (With a Diagram), 
The Thermoelectric Positions of Cobalt and Bismuth. By Pro- 
fessor Cargill G. Knott, D.Sc., F.R.S.E., .... 
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