104 BOTANICAL GAZETTE [FEBRUARY 
enormous reduction in the percentage of nitrate nitrogen with 
mottling. 
TABLE XIII 
NITRATE NITROGEN 
Sampl Sampl S 1 — 
ample ample ample nitrogen 
Leaf no. L no. II no. til Average | per 100 gm. 
dry weight 
OOO atin hws ee ©.004,28 | 0.002,78 | 0.002,68 | 0.003,25 | 0.0485 
Mottled Po) Corer es ©.001,90 | 0.000,80 | 0.000,72 | 0.001,14 | 0.0196 
Migtied Fess as ©.000,05 | 0.000,10 | 0.000,05 | 0.000,07 | 0.OOoII 
Table XIV summarizes the results given in tables IX, XII, and 
XIII, and shows the following changes in the nitrogen compounds 
of the leaf with mottling. When the green leaves of Coleus were 
TABLE XIV 
COMPARISON OF NITROGEN FOUND 
Form of nitrogen Percentage wet bution ane sige ol —— rn dry 
weig t ' “a coca a 
Green 
Protein nitrogen. ...............- 0.213 2.38 
N as ammonium salts............. 0.050 18.8 ©.79 
Pe OG BUR ones ccc ees eae cs 0.003 %.2 0.05 
FO elie gat oh ora °. 266 100.01 4.19 
Mottled A 
Protein nitrogen. ©. ..---...---... 0.081 74.3 1.39 
as ammonium salts............. 0.027 24.8 0.46 
Wag vitte ee. 0.001 0.02 
TOME Pee ee eee ©. 109 100.01 1.87 
Mottled B 
Protein nitrogen Pets cee s eee. Oe 7:14 
N as ammonium salts............. ee Ce Bee ay —0.05 
Was nitrate. 2 et O.0000 4 iS 0.0011 
TOtab es 5 Sis i es POR SR, err ka es I.09 
compared with the mottled, it was found that the amount of protein 
nitrogen, nitrogen as ammonium salts, and nitrogen as nitrates 
disappeared as the leaves mottled. The greatest decrease was 
found in the protein nitrogen, which showed that the protein 
