PROCEEDINGS 
OF THE 
ROYAL SOCIETY OF EDINBURGH. 
SESSION 1871-72. 
CONTENTS. 
Monday , 4 th December 1871. 
Opening Address. Session 1871-72. By Sir Robert 
Christison, Bart., . 
PAGE 
531 
Monday , 18£A December 1871. 
On the Computation of the Strengths of the Parts of Skele¬ 
ton or Open Structures. By Edward Sang, . . 575 
On Vortex Motion. By Professor Sir William Thomson, . 576 
On the Ultramundane Corpuscules of Le Sage. By Prof. 
Sir W. Thomson, . 577 
Note on Spherical Harmonics. By Professor Tait, . 589 
Laboratory Notes: On Thermo-Electricity. By Professor 
Tait, . . . .. . . 597 
Monday , 1 5 th January 1872. 
On the Relation of Magnetism to Temperature. By D. H. 
Marshall, Esq., M.A., Assistant to the Professor of 
Natural Philosophy. Communicated by Professor 
Tait. (With a Plate), .... 603 
Note on a Singular Property of the Retina. By Professor 
Tait, ....... 605 
[Turn over. 
