THE 



>OUTH AFRICAN JOURNAL 

 OF SCIENCE: 



BEING THE ORGAN OF THE 



SOUTH AFRICAN ASSOCIATION 



ADVANCEMENT OF SCIENCE,'? 



FOR THE Sc\$SQA 



Issued Monthly. 



VOL. IX. MAY, 1913. NO. 10. 



CAPE TOWN. 



PUBLISHED BY THE ASSOCIATION. 



j ^ 3 [Price 2s. 



