THE 



SOUTH AFRICAN JOURNAL 

 OF SCIENCE: 



BEING THE ORGAN OF THE 



SOUTH AFRICAN ASSOCIATION 



FOR THE 



ADVANCEMENT OF SCIENC 





Issued Monthly. ■'''"■k>M*^Al3^-^' 



VOL. YIII. NOVEMBER, 1911. NO. 4. 



CAPE TOWN. 



PUBLISHED BY THE ASSOCIATION 



~i [Price 2s 



