THE 



SOUTH AFRICAN JOURNAL 

 OF SCIENCE: 



BEING THE ORGAN OF THE 



SOUTH AFRICAN ASSOCIATION 



FOR THE 



ADVANCEMENT OF SCIENCE 





Issued Monthlw 





VOL. VI. SEPTEMBER, 1910. No. 1 1 



CAPE TOWN : 



PUBLISHED BY THE ASSOCIATION, 



191 o [Frice 2s 



^ri( 



