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Contents. 
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On the Periods of the Elliptic Functions of Weierstrass. By R. T. A. Innes, Director 
of the Government Observatory, Johannesburg, F.R.A.S. Issued separately 
October 7, 1907, ....... . . 357 
Preliminary Note on the action of Sodium Ethylate on Trichloromethyl-Sulphonic 
Chloride. By Professor A. Crum Brown and Thomas F. Cowie, B.Sc. Issued 
separately November 8, 1907, . . . . . . . 369 
Note on Quaternion Integral Theorems. By Heinrich Hermann, D.Sc. (Tubingen). 
Communicated by Professor C. G. Knott. Issued separately November 8, 1907, . 371 
Meetings of the Society — Session 1906-1907, . . 373 
Donations to the Library of the Society from 1905 to 1907, ... 386 
List of Periodicals and Annual Publications added to the Library by Purchase, 414 
Abstract of Accounts for Session 1906-1907, .... . 418 
Index, ........... 429 
