CONTENTS. 
Page. 
The effect of manganese on pineapple plants 7 
Introduction 7 
Pineapple roots 7 
Leaves 8 
Oxalate of lime 11 
Other visible effects of manganese 11 
The chemistry of the pineapple plant 12 
The composition of the pineapple plant as affected by manganese 13 
The ripening of the pineapple fruit 14 
The chemistry of ripening 16 
Summary 19 
ILLUSTRATIONS. 
Page. 
Plate I. Structure of pineapple leaf showing effect of manganese 8 
II . Cells from pineapple leaves and fruits 8 
(5) 
[Bull. 28] 
