PROCEEDINGS 
OF THE 
ROYAL SOCIETY OF EDINBURGH. 
SESSION 1911-12. 
Part II.] YOL. XXXII. [Pp. 113-208. 
CONTENTS. 
NO. • PAGE 
XII. The Theory of Circulants from 1861 to 1880. By Thomas 
Mum, LL.D., ....... 136 
{Issued separately May 17, 1912.) 
XIII. “ On the Singular Solutions of Partial Differential Equations 
of the First Order.” By H. Levy, M.A., B.Sc., Carnegie 
Scholar. ( Communicated by D. Gibb, M.A., B.Sc.), . 150 
{Issued separately May 17, 1912.) 
XIV. On General Dynamics : — I. Hamilton’s Partial Differential 
Equations and the Determination of their Complete 
Integrals. By Professor A. Gray, F.R.S., . . .164 
{Issued separately May 17, 1912.) 
XV. The Fata Morgana. By Professor F. A. Forel, Morges, 
Switzerland, . . . . . . .175 
{Issued separately May 25, 1912.) 
XVI. The Sun as a Fog Producer. By Dr John Aitken, F.R.S., . 183 
{Issued separately , 1912.) 
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JUN 4 III 
