THE 



SOUTH AFRICAN JOURNAL 

 OF SCIENCE: 



BEING THE ORGAN OF THE 



SOUTH AFRICAN ASSOCIATION 



F'OR THE 



ADVANCEMENT OF SCIENC 



NCE.-^ 



Issued Monthly. 





VOL VI. MAY, 1910. No. 7. 



CAPE TOWN: 



PUBLISHED BY THE ASSOCIATION. 



1910 [Price 2s. 



