1915] SCHREINER & SKINNER—GLYCOCOLL 455 
TABLE IV—Continued 
| 
| COMPOSITION OF CULTURE SOLUTIONS \ GREEN WEIGHT 
No. at 
| POs NHs | KO methy! bd eco With 50 pom 
ppm. ppm. ppm. m. | m. 
Mey sig ys 8 16 56 2.34 1.89 
AO Poa ee | 8 24 48 2.54 1.70 
MW eases pe 8 32 40 2.90 1.70 
BE ek vite a eo 8 | 8 40 32 2.42 1.65 
Bets Be 8 48 24 2.45 1.60 
Bact ee as 8 56 16 2.22 E30 
Lo OSS Saree 8 64 8 2.32 4.70 
See ee ee 8 72 fo) 1.52 45 
gee ea re ° ° 80 i342 1.43 
Shee ae ed fe) 8 72 1.95 1.45 
RO oi ° 16 64 2.29 1:50 
io) case Ie reer ° 24 56 2.27 Ess 
ae eee ee ° 32 48 2,30 1.65 
OR es x fo) 40 40 2.25 1.65 
ras, ° 48 32 2.20 z 67 
Ee ee ee ° 56 24 2.32 1.67 
Serre. ) 64 16 1.96 1.50 
EUs Re ° 72 1.76 1.40 
ce See aN ° 80 ° 4.35 | 1,28 
distorted stems and produces broad twisted leaves. Cumarin, how- 
ever, does not cause a pale green leaf when grown in similar nutrient 
solution as does the methyl glycocoll. A set of normal and methyl 
-glycocoll cultures is shown in figs. 1 and 2. The characteristic 
action is distinctly shown in the plants in fig. 2; the leaves are 
twisted and broad, which is in striking contrast to the straight 
upright plants of the normal cultures in fig. 1. 
In analyzing the green weight figures given in table IV, it 
is interesting to note that the methyl glycocoll has reduced growth 
more in some of the cultures than in others, which will be brought out 
in the tables that follow. A close examination shows that the reduc- 
tion was most in those solutions which normally produce the largest 
growth; that is, the difference between the green weight of specific 
cultures of some compositions without and with methyl glycocoll 
is greater where the growth is greater in the solutions containing 
only the nutrient salts. 
The 66 cultures given in table IV permit of better discussion 
when they are arranged according to the triangular scheme upon 
which their composition depends. This scheme has been fully 
