IV 
CONTENTS. 
PAGE 
Further Study of the two Forms of Liquid Sulphur as 
Dynamic Isomers. By Alexander Smith and C. M. 
Carson, . . . . .352 
(. Issued separately November 12, 1906.) • 
The Theory of Alternants in the Historical Order of 
Development up to 1860. By Thomas Muir, LL.D., 357 
( Issued separately November 16, 1906.) 
The Theory of Circulants in the Historical Order of 
Development up to 1860. By Thomas Muir, LL.D., 390 
{Issued separately November 16, 1906.) 
Initiation of Deep-Sea Waves of Three Classes : (1) from a 
Single Displacement ; (2) from a Group of Equal and 
Similar Displacements ; (3) by a Periodically Vary- 
ing Surface Pressure. By Lord Kelvin, . . 399 
{Issued separately November 17, 1906.) 
