CONTENTS 
Page. 
KING, ALBERT E. W. Physical properties of Philippine 
concrete and concrete aggregates 105 
The Philippine Journal of Science is issued twelve times a 
year. The sections were discontinued with the completion of 
Volume XIII (1918). 
-Yearly subscription, beginning with Volume XIV, 5 dollars 
United States currency. Single numbers, 50 cents each. 
Publications sent in exchange for the Philippine Journal of 
Science should be addressed : Library, Bureau of Science, Manila, 
P. I, • 
Subscriptions may he sent to the Business Manager, Phil- 
ippine Journal of Science, Bureau of Science, Manila, P. I., or 
to any. of the agents listed on the third page of this cover. 
Entered at the post office at Manila, P. I., as second-class matter. 
