in;'. f 
Issued September 10, 191'i. 
HAWAII AGRICULTURAL EXPERIMENT STATION, 
E. V. WILCOX, Special Agent in Charge. 
Bulletin No. 28. 
THE EFFECT OF MANGANESE ON 
PINEAPPLE PLANTS 
AND 
THE RIPENING OF THE 
PINEAPPLE FRUITSl 
BY 
E. V. WILCOX, 
Special Agent in Charge 
AND 
W. P. KELLEY, 
Chemist. 
UNDER THE SUPERVISION' OF 
OFFICE OF EXPERIMENT STA 
U. 8. DEPARTMENT OF AGRICTJLTU 
WASHINGTON: 
GOVERNMENT PRINTING OFFICE. 
i:M2. 
