112 BOTANICAL GAZETTE [FEBRUARY 
The nitrogen in F, was reduced one-half or more, the nitrogen 
in F, was changed very little, while the nitrogen entirely disappeared 
in F, as the leaves mottled. This would mean that such com- 
pounds as nucleoproteins, glycoproteins, phosphoproteins, albumins, 
and globulins were rapidly being broken down, while the amount of 
derived proteins, amino acids, prolamines, ammonia compounds, 
and other nucleic acid metabolic products remained practically 
constant. Since the nitrogen in F, practically disappeared, it 
would seem that the phospholipins and amines were breaking down, 
TABLE XXVI 
NITROGEN OF VARIOUS FRACTIONS IN GREEN AND MOTTLED LEAVES 
Ss i S | S i pment 
tro, 
Leaf no. T no il =| no fit | AveTae | per roo gm. 
dry weight 
CHOMP eu. orcs «Gade 17 17 I 0.18 3-91 
Gree Fan ds iois sy vewe bes 0.018 0.017 0.021 0.019 1.43 
AstOeO Sp ai cues 0.005 0.002 004 0.004 0.61 
Total dry weight...... 0.193 0.189 0.215 a ae Saree 
Mottled A. Fe... iusiss 0.06 0.06 0.08 0.07 1.86 
Mottled: Ay Py. osci io 0.017 0.018 0.027 0.021 $134 
Mottled A, Bei a None None None None None 
Total dry weight...... 0.077 0.078 0.107 @.098 Is caves 
MMotted Bo Be. acy sc 0.05 0.05 0.05 0.05 1.10 
MotUed 8, ¥5.. ...05.<. 0.015 0.010 0.006 0.010 0.67 
Mottled B, Fo... 4544: None None None None None 
Total dry weight...... 0.065 0.060 0.056 GOOG fo cine ss 
and that the plant must be drawing upon its last sources of nitrogen 
before death ensues. In this connection the work of KORAPETOVA 
and SOBASHNIKOVA (40) is very significant. They grew seedlings 
of rye and barley in inadequate nutrient solutions and found that 
the total amount of proteins decreased as growth progressed. In 
mottling of Coleus one likewise seems to be dealing with inadequate 
(especially nitrogen) nutrition. Here too proteins are decomposed, 
probably owing to the shortage of nitrogen. 
In mottled leaves the phosphates of F,; were reduced to one- 
third that of the green leaves, while the phosphates in F, increased 
