IV 
CONTENTS. 
Notes on the Effect of Electric Oscillations (co-directional 
and transverse) on the Magnetic Properties of Iron. 
By James Russell, ..... 
( Issued separately February 8, 1906.) 
On a Theorem in Hypercomplex Numbers. By J. H. 
Maclagan-Wedderburn, Carnegie Research Fellow, . 
{Issued separately February 9, 1906.) 
Library Aids to Mathematical Research. By Thomas 
Muir, LL.D., ...... 
( Issued separately February 1 4, 1906.) 
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33 
48 
51 
