SOUTH AFRICAN JOURNAL 

 OF SCIENCE; 



BEING THE ORGAN OF^THE 



SOUTH AFRICAN ASSOCIATION 



FOR THE 



ADVANCEMENT OF SCIENCE. 



Issued Monthly. 



i£-4jt 



Li * 



VOL IX. JANUARY, 1913. NO. 6. 



CAPE TOWN. 



PUBLISHED BY THE ASSOCIATION. 



1913 [Price 2s. 



