THE 



SOUTH AFRICAN JOURNAL 

 OF SCIENCE: : S 



BEING THE ORGAN OF THE 



SOUTH AFRICAN ASSOCIATION^ 



FOR THE 





ADVANCEMENT OF SCIENCE, 



Issued Monthly. 



VOL. IX. JULY, 1913. NO. 12. 



CAPE TOWN. 



PUBLISHED BY THE ASSOCIATION. 



1913 [Price 2s. 



