THE 



SOUTH AFRICAN JOURNAL 

 OF SCIENCE: 



BEING THE ORGAN OF THE 



SOUTH AFRICAN ASSOCIATION 



FOR THE 



ADVANCEMENT OF SCIENCE. 



Issued Monthly. 



VOL. VI. 



APRIL. 1910. 



No. 6. 



CAPE TOWN : 



PUBLISHED BY THE ASSOCIATION. 



1910 



[Price 2§. 



