VI 
Contents. 
The Functions of the Eolandic Cortex in Monkeys. By W. A. Jolly, M.B., and 
Sutherland Simpson, M.D., D.Sc. ( From the Physiological Laboratory , University 
of Edinburgh.) Communicated by Professor E. A. Schafer, F.R.S. Issued 
separately May 6, 1907, ........ 
The Minors of a Product- Determinant. By Thomas Muir, LL.D. Issued sepa- 
rately May 29, 1907, ........ 
Heusler’s Magnetic Alloy. By Alexander D. Eoss, M.A., B.Sc., Houldsworth 
Research Scholar, University of Glasgow. Communicated by Professor A. Gray, 
F.R.S. Issued separately May 29, 1907, ...... 
The Relation between Normal Take-up or Contraction and Yarn Number for the 
same Degree of Twist in Twisted Threads. By Thomas Oliver, B.Sc. (London 
and Edinburgh), Carnegie Research Fellow. Communicated by Dr C. G. Knott. 
Issued separately May 30, 1907, ....... 
The Relation between Normal Take-up or Contraction and Degree of Twist in 
Twisted Threads when the Singles are of Unequal Sizes. By Thomas Oliver, 
B.Sc. (London and Edinburgh), Carnegie Research Fellow. Communicated by 
Dr C. G. Knott. Issued separately May 30, 1907, .... 
On the Influence of Temperature on the Photo-Electric Discharge from Platinum. 
By W. Mansergh Yarley, D.Sc. (Manchester and Leeds), Ph.D. (Strassburg), 
B. A. (Cantab.), Assistant Professor of Physics and Electrical Engineering, and 
Fred. Unwin, M.Sc. (Manchester), Assistant Lecturer in Physics, Heriot-Watt 
College, Edinburgh. Communicated by Professor F. G. Baily, M.A., M.I.E.E. 
Issued separately May 31, 1907, ....... 
The Theory of Axisymmetric Determinants in the Historical Order of its Develop- 
ment up to 1860. By Thomas Muir, LL.D. Issued separately July 19, 1907, . 
The Composition of the Red Clay. By F. W. Clarke, D.Sc., LL.D., Chief Chemist, 
U.S. Geological Survey. Communicated by Sir John Murray, K.C.B., F.R.S., 
etc. Issued separately July 19, 1907, ...... 
The Physical Properties of Mixed Solutions of Independent Optically- Active Sub- 
stances. By Clark Ranken, B.Sc., Carnegie Research Scholar, and W. W. 
Taylor, M.A., D.Sc. Communicated by Professor Crum Brown, F.R.S. Issued 
separately July 19, 1907, ........ 
On Vibrating Systems which are not subject to the Boltzmann- Maxwell Law. 
(Second Paper.) By Dr W. Peddie. Issued separately August 28, 1907, 
On the Partition of Heat Energy in the Molecules of Gases. By Dr Paul Ehrenfest. 
Communicated by Dr W. Peddie. Issued separately August 28, 1907, 
Preliminary Note on the Internal Structure of Sigillaria mamillaris , Brongniart, 
and Sigillaria scutellata , Brongniart. By R. Kidston, F.R.S. L. & E., F.G.S., 
Foreign Mem. Kaiserl. Mineral. Gesell. zu St Petersburg. Issued separately 
August 28, 1907, ......... 
Note on a New Species of Lepidodendron from Petty cur ( Lepidodendron Pettycurense). 
By R. Kidston, F.R.S. L. & E., F.G.S., Foreign Mem. Kaiserl. Mineral. Gesell. 
zu St Petersburg. Issued separately September 9, 1907, 
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