MAXGANESE CHLOROSIS OF PINEAPPLE. 
17 
The text to Figure 1 and Table 11 show that chlorosis and severe 
depression in growth were caused by manganese dioxid, with 5, 10\ 
or 20 milligrams per liter of iron supplied from ferrous sulphate, and 
also by 18 milligrams per liter of manganese from manganous sulphate 
(0.005 per cent manganous sulphate). When the leaves were dipped 
in iron solution chlorosis was overcome, but full normal growth was 
& SO 20 40 80 
Fig. 1.— (Results of Experiment III.) Effect of manganous sulphate and manganese dioxid on the 
growth of rice in nutrient solutions with various amounts of iron supplied from ferrous sulphate. 
not induced. The writer found it very difficult to supply iron to the 
leaves of the rice plant because they seem adapted for shedding solu- 
tions. Where the iron penetrated the leaves, very dark green spots 
appeared. When the amount of iron in the solution was increased 
excessively, the chlorotic effect of manganese was completely over- 
come. In fact, apparently, because of its removal of some of the 
excessive iron, manganese dioxid gave slightly better results than 
the check. 
86067— 2-it 3 
