THE 



SOUTH AFRICAN JOURNAL 

 OF SCIENCE: 



BEING THE ORGAN OF THE 



SOUTH AFRICAN ASSOCIATION 



FOR THE 



.ADVANCEMENT OF SCIENCE. 



W^^l> 



Iss7ifd Monthly. 





VOL. VIII. JUNE, 1912. NO. 11 



CAPE TOWN. 



PUBLISHED BY THE ASSOCIATION. 



1 91 2 [frioe 2». 



