IV 
CONTENTS. 
N0 - PAGE 
XXVIII. Point Binomials and Multinomials in relation to Mendelian 
Distributions. By John Brownlee, M.D., D.Sc., . 396 
(. Issued separately October 31, 1912.) 
XXIX. On Novel Illustrations of Gyrostatic Action. By James G. Gray, 
D.Sc., Lecturer on Physics in the University of Glasgow, . 406 
{Issued separately October 31, 1912.) 
XXX. The Geometry of Twin Crystals. By Dr John W. Evans, of the 
Imperial Institute and Birkbeck College, London. ( Communicated 
by Professor J. W. Gregory, F.B.S.), . . .416 
{Issued separately , 1912.) 
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