1g21] SCHERTZ—MOTTLING 95 
of the leaf. The leaves were taken from the same plants, which 
were grown in ordinary potting soil, dried to constant weight 
at 100°C., and then the dry material ashed at a low red heat. The 
iron was calculated as free iron. 
The analysis for iron showed that the amount of iron increased 
in the abscission layer, in the petioles, and in the leaf blades in 
TABLE IV 
COMPARISON OF AMOUNTS OF IRON IN GREEN AND MOTTLED LEAVES 
P, G _ Grams of 
tage Tams o! iron) iron per 100 
Material Wet be Grams of : 
(average) 
Mottled leaves 
ae 0.3450 | 0.0200 | 5.79 ©.000,016 000,80 
Abscission layer....| {0.2585 | 0.0146 | 5.65 ©.000,014) ©.000,98}) 0.108 
0, 2660 0166 | 6.24 9.000,024| ©.001,47 
" 2.0320 | 0.0865 | 4.25 0.000,042| 0.000,49 
ROMMEL ince 1.5550 | 0.0582 | 3.74 | ©.000,036) 0.000,62;) 0.042 
1.4080 | 0.0588 | 4.17 000, ©.000,15 
8.5660 | 0.4930 | 5-75 ©.000;81 | 0.001,64 
Leaf blade......... 5 res 3 ae [0 000,37 0.001,21 0.130 
6.4706 | 0.4520 | 6.98 0.000,48 | 0.001,06 
Green leaves 
: 0.6450 .0300 | 4.65 ©.000,02 | 0.000,666 
Abscission layer....| {0.4224 | 0.0206 | 4.87 0.000,02 |0.000,970?) 0.079 
; 0.3980 | 0.0192 | 4.82 ©.000,02 | 0.000,729 
4.7160 | 0.1690 | 3.58 ©.000,045] 0.000,266) 
gis Rane 2.4650 099 4.02 ©.000,038} 0.000,3837} 0.030 
1.5780 | 0.0988 | 6.26 © .000,024| 0.000,23¢) 
17.4220 | 1.2100 | 6.94 ©.000,47 | 0.000,388) 
Leal blade... :.5.<. 8.1016 | 0.5575 | 6.88 | 0.000,39 |0.000,6997 9.073 
10.3500 .8080 | 7.80 9.000,90 | 0.001,IIO 
the mottled leaves. This result disagreed with the microchemical 
report, perhaps owing to the fact that the iron was bound in some 
way and was released only by ashing the leaf. It showed that about 
1.55 per cent of the ash of the green leaves was Fe,0;. According 
to PALLADIN (40), beech leaves have 2.30 per cent of Fe,O, in the 
ash, while Jost (27) states that tobacco leaves have 1.95 per cent. 
According to PALLADIN 0.09 per cent of the dry weight of pea 
