REPORT 



OF THE 



Twentieth Annual Meeting 



OF THE 



South African Association 



FOR THE ADVANCEMENT OF SCIENCE, 



BEING VOLUME XIX OF THE 



SOUTH AFRICAN JOURNAL OF SCIENCE. 



LOURENCO MARQUES %^ ^"^^ 

 1922 



JULY 10-15. 



JOHANNESBURG : 

 PUBLISHED BY THE ASSOCIATION. 



1922. 



