Contents. 
v 
Oil the Effect of Longitudinal Magnetisation on the Interior 
Volume of Iron and Nickel Tubes. By Professor Cargill G. 
Knott, D.Sc., F.B.S.E., ...... 
On some Relations between Magnetism and Twist. Parts II., III. 
By Professor Cargill G. Knott, D.Sc., F.R.S.E., . 
On the Gravimetric Composition of Water. A Preliminary Com- 
munication. By Professor W. Dittmar, F.R.S., . 
Investigation of the Action of Nicol’s Polarising Eye-Piece. By 
Edward Sang, LL.D. (With a Plate), . 
Note on Dr Sang’s Paper. By Professor Tait, 
On the Extension of Brouncker’s Method to the Comparison of 
several Magnitudes. By Edward Sang, LL.D., . 
Meetings of the Royal Society — Session 1890-91, . 
Donations to the Library, ...... 
Obituaky Notices, ...... i- 
Tndex, ....... 
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315 
318 
320 
323 
337 
341 
349 
357 
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xxv 
