k 
% 
^ro&9 /V 
The Philippine 
Journal of Science 
Volume 17 
JULY TO DECEMBER, 1920 
WITH 24 PLATES AND 56 TEXT FIGURES 
/UVUsonian InsfifZT? 
% 
2^ IM 
• %onal Musev^ 
176542 
MANILA 
BUREAU OF PRINTING 
1920 
