THE 



SOUTH' AFRICAN JOURNAL 

 OF SCIENCE: 



BEING THE ORGAN OF THE 



SOUTH AFRICAN ASSOCIATION 



FOR THE 



ADVANCEMENT OF SCIENCE, 





Issued Monthly 



'OL IX. DECEMBER, 1912. NO. 5. 



CAPE TOWN. 



PUBLISHED BY THE ASSOCIATION. 



1912 [Price 2s. 



