96 BOTANICAL GAZETTE [FEBRUARY 
leaves and 0.11 per cent of the dry weight of bean leaves was 
Fe,0;, while Coleus leaves had 0.23 per cent as Fe,O,. The 
Fe,O, in beech leaves increased from o.8 per cent of the ash in 
May to 1.3 per cent of the ash in October. One concludes that the 
mottling of the Coleus leaves was not due to a deficiency in iron, 
for at all times the leaves had enough iron, when compared with 
B A 
Fics. 5, 6.—Fig. 5, plants from which leaves were taken for analysis: leaves 
missing on nics part of plant at left taken for analysis; lower leaves mottled and 
fallen off; lower pair of leaves still on each plant partially mottled; plant at left 
type A, plant at right type B; fig. 6, another group of plants from which leaves 
were taken for analysis: plant at right type A, plant at left type B; lower pair of 
leaves still on each plant partially mottled; plants grown close together to produce 
larger leaves, accounting for leaflessness of stems. 
other plants, to carry on their metabolic activities in a normal 
manner. This fully agrees with the conclusions drawn from the 
cultures. 
Two types of plants were used for the analyses which follow. 
Plants of type A were grown in 3- and 4-inch pots, until ready for 
repotting, and then put into 6- and 8-inch pots, using ordinary 
