1890-91.] 
Meetings of the Society. 
351 
2. On Berberine. By Professor W. H. Perkin, F.R.S. 
3. On some hitherto unproved. Theorems in Determinants. By Thomas 
Muir, LL.D. P. xviii. 73. 
4. On a Problem of Elimination connected with Glissettes of the 
Ellipse and Hyperbola. By Thomas Muir, LL.D. 
5. The Equation of the Glissette of the Curve = when the 
Guides are the Axes of Coordinates. By the Hon. Lord M‘Laren. P. 
xviii. 83. 
Monday , 2 d February 1891. 
Sir Douglas Maclagan, M.D., President, in the Chair. 
At the request of the ( Council, Professor Rutherford gave an 
Address 
On the Sense of Hearing. 
The following Candidate for Fellowship was balloted for, and 
declared to be a duly elected Fellow of the Society : — 
John B. Clark, M.A. 
Monday , 1 6th February 1891. 
A. Forbes Irvine, Esq., LL.D., in the Chair. 
The following Communications were read : — 
1. Further Note on the Virial. By Professor Tait. 
2. Haycraft’s process for the Estimation of Uric Acid. A Reply to 
the Adverse Criticism of Salkowski and Jolin, and a Review of the 
favourable Notices of Hermann, Czapek, and Camerer. By John 
Berry Haycraft, M.D., D.Sc. P. xviii. 255 (Abstract). 
3. Note on Potassium Persulphate. By H. Marshall, D.Sc. P. 
xviii. 63. 
4. On the Interaction of Longitudinal and Circular Magnetisations in 
Iron and Nickel Wires. (Second Note.) By Professor Cargill G. 
Knott. P. xviii. 124. 
5. Professor Kelland’s Problem on Superposition. By Robert Brodie, 
Esq.. Communicated by Professor Tait. T. xxxvi. 307. 
6. 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. P. xviii. 139. 
7. A New Method for the Estimating the Specific Gravity of the 
Blood. By John Berry Haycraft, M.D., D.Sc. P. xviii. 251. 
