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On the Steady Motion of an Incompressible Perfect Fluid 
in Two Dimensions. By Professor Tait, . . 142 
On the most general Motion of an Incompressible Perfect 
Fluid. By Professor Tait, .... 143 
Monday , 4 th April 1870. 
Address by Professor Wyyille Thomson on the “ Condition 
of the Depths of the Sea,” , 144 
Monday , 18£A April 1870. 
Facts as to Brain-Work; in Illustration of the New and 
Old Methods of Philosophical Inquiry in Scotland. 
By Thomas Laycock, M.D., .... 145 
On Change of Apparent Colour by Obliquity of Vision. By 
Egbert H. Bow, C.E,, F.B.S.E., . . • 155 
Monday , 2 d May 1870. 
Remarks on the Theories of Capillary Action. By Edward 
Sang, Esq., F.E.S.E., ..... 160 
Theory of Construction of the Great Pyramid. By John 
Christie, Esq. Communicated by the Eev. W, Lindsay 
Alexander, D.D., ..... 162 
On the Structure of Tubifex, By W. C. MTntosh, M.D., . 166 
Monday , l§th May 1870. 
Primitive Affinity between the Classical and the Low German 
Languages. By the Hon. Lord Neaves, . .167 
On the Genetic Succession of Zooids in the Hydroida. By 
Professor Allman, . . . . .168 
On Green’s and other Allied Theorems. By Professor Tait, 168 
Proposed Method of ascertaining the Temperature of Falling 
Bain. By Thomas Stevenson, F.B.S.E., Civil Engineer, 170 
Monday , Qth June 1870. 
Letter from Professor W. J. Macquorn Bankine as to 
Diagrams of Forces in Framework, . . . 171 
On Spectra formed by Doubly Befracting Crystals in 
Polarised Light. By Francis Deas, LL.B., F.B.S.E., . 172 
On the Heat Disengaged in the Combination of Acids and 
Bases. Second Memoir. By Thomas Andrews, M.D., 
F.B.S., Hon. F.R S.E., .... 174 
