THE 



SOUTH AFRICAN JOURNAL 

 OF SCIENCE: 



BEING THE ORGAN OF THE 



SOUTH AFRICAN ASSOCIATION 



FOR THE 



ADVANCEMENT OF SCIENCE 



Issued Monlhly. 





\' 



VOL. VI. OCTOBER, 1910. No. 12. 



CAPE TOWN: 



PUBLISHED BY THE ASSOCIATION. 



1910 [Price 2s. 



