THE 



SOUTH AFRICAN JOURNAL 

 OF SCIENCE: 



BEING THE ORGAN OF .THE 



I SOUTH AFRICAN ASSOCIATION 



FOR THE 



ADVANCEMENT OF SCIENCE. 



y^mt 



Issued Monthly. 



^OL IX. FEBRUARY, 1913. NO. 7. 



CAPE TOWN. 



PUBLISHED BY THE ASSOCIATION. 



1913 [Price 28; 



