IV 
CONTENTS. 
On the most general Motion of an Incompressible Perfect Fluid. By 
Professor Tait, ....... 
Address by Professor Wyville Thomson on the “ Condition of the 
Depths of the Sea,” ...... 
Facts as to Brain-Work ; in Illustration of the New and Old Methods 
of Philosophical Inquiry in Scotland. By Thomas Lay cock, M.D., 
On Change of Apparent Colour by Obliquity of Vision. By Robert 
H. Bow, C.E., F.R.S.E., ...... 
Remarks on the Theories of Capillary Action. By Edward Sang, 
Esq., F.R.S.E., ....... 
Theory of Construction of the Great Pyramid. By John Christie, 
Esq. Communicated by the Rev. W. Lindsay Alexander, D.D., 
On the Structure of Tubifex. By W. C. MTntosh, M.D., 
Primitive Affinity between the Classical and the Low German Lan¬ 
guages. By the Hon. Lord Neaves, .... 
On the Genetic Succession of Zooids in the Hydroida. By Professor 
Allman, ........ 
On Green’s and other Allied Theorems. By Professor Tait, . 
Proposed Method of ascertaining the Temperature of Falling Rain. 
By Thomas Stevenson, F.R.S.E., Civil Engineer, . 
Letter from Professor W. J. Macquorn Rankine as to Diagrams of 
Forces in Framework, ...... 
On Spectra formed by Doubly Refracting Crystals in Polarised Light. 
By Francis Deas, LL.B., F.R.S.E., .... 
On the Heat Disengaged in the Combination of Acids and Bases. 
Second Memoir. By Thomas Andrews, M.D., F.R.S., Hon. F.R.S.E., 
Note on Professor Bain’s Theory of Euclid I. 4. By Wm. Robertson 
Smith, M.A., Assistant to the Professor of Natural Philosophy. 
Communicated by Professor Tait, ..... 
A Simple Mode of Approximating to the Wave-Length of Light. By 
W. Leitch, Assistant to the Professor of Natural Philosophy in the 
University of Glasgow. Communicated by Professor Tait, 
Note on Linear Partial Differential Equations. By Professor Tait, . 
On the Oxidation Products of Picoline. By James Dewar, F.R.S.E., 
Lecturer on Chemistry, Veterinary College, Edinburgh, 
Notes of some Experiments on the Rate of Flow of Blood and some 
other Liquids through tubes of narrow diameter. By J. Matthews 
Duncan, M.D., F.R.S.E., and Arthur Gamgee, M.D., F.R.S.E., 
On Cystine (C 3 H 7 N0 2 S). By James Dewar, F.R.S.E., Lecturer on 
Chemistry, Veterinary College, Edinburgh, and Arthur Gamgee, 
M.D., F.R.S.E., Lecturer on Physiology, at Surgeon’s Hall, Edin¬ 
burgh, . . . . . . . 
Notes from the Physical Laboratory of the University. By Professor 
Tait. (With a Plate), ...... 
Donations to the Society, ...... 
Opening Address, Session 1870-71. By David Milne Home, Esq., . 
Additional Remarks on the Theory of Capillary Attraction. By 
Edward Sang, Esq., ...... 
Laboratory Notes : On Thermo-Electricity. By Professor Tait, 
Note on Linear Differential Equations in Quaternions. By Professor 
Tait, ........ 
On some Quaternion Integrals. By Professor Tait, . 
Note on an Ice Calorimeter. By Dr A. Crum Brown, 
Address “ On the Educational System of Prussia.” By Principal Sir 
Alex. Grant-, Bart., ....... 
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