460 BOTANICAL GAZETTE [JUNE 
of 22 per cent in growth. The absorption of P,O,, NH;, and K.0 
from these solutions for the 15 normal cultures was 18.2 mg., 
against 15.5 mg. for the total number of cultures containing methyl 
glycocoll, a reduction of 15 per cent. Again it is seen that in these 
cultures where absorption and growth is small the methyl] glycocoll 
is less harmful. 
TABLE VII 
GROWTH OF WHEAT PLANTS IN CULTURE SOLUTIONS OF GROUP ¢ WITHOUT AND WITH 
METHYL GLYCOCOLL 
Cc I CULTURE SOLUTIONS GREEN WEIGHT 
ose With With 
I 
POs NH, K.0 Gisial cteceal methyl glycocoll 
ppm. ppm. ppm gm. . 
SS a Pinas 64 8 Fr a7 1.45 
yg aE Bete sees 56 8 16 1.80 1.55 
1 OME ESE! 56 16 8 1.85 1.45 
eye 48 8 24 1.95 +40 
je | ag eer 48 24 8 ro7s 1.45 
TS ey 40 8 32 a 07 1.55 
BO Ee ys 40 32 8 1.95 1.50 
7 eres eae 22 8 40 oT 1.50 
eS Set enrne 32 40 8 1.90 1.60 
ps eg ae 24 8 48 2.09 1.82 
cA ee 24 48 8 1.89 1.40 
SOC 10 8 56 2.30 1.42 
BA ey eo ek 16 56 8 1:67 1.57 
Day ee ete SOR a 8 8 64 2.07 1.59 
A eee sion 8 64 8 2.32 1.70 
In table VIII are given the green weights of plants grown in 
solution containing only two nutrient salts (group d), with and 
without methyl glycocoll. Solutions containing only two salts 
produce less growth than solutions containing three salts, in any 
proportion, 
The total growth of the 27 cultures without methyl glycocoll 
was 44.72 grams green weight, against 37.32 grams for the cultures 
with methyl glycocoll, a reduction of only 16 per cent. 
From tables V, VI, VII, and VILL it is apparent that growth was 
greatest in the cultures of group a, and that the greatest amount of 
absorption took place in these solutions. The harmful effect of 
methyl glycocoll was also most marked in this group of solutions. 
A comparison of tables VI, VII, and VIII shows that those solutions 
