THE 



SOUTH AFRICAN JOURNAL 

 OF SCIENCE: 



BEING THE ORGAN OF,, THE 



SOUTH AFRICAN ASSOCIATION 



FOR THE 



ADVANCEMENT OF SCIENCE, 



Issued Monthly, 



VOL. IX. NOVEMBER, 1912. NO. 4. 



CAPE TOWN. 



PUBLISHED BY THE ASSOCIATION. 



1 91 2 [Price 2s. 



