462 BOTANICAL GAZETTE [JUNE 
nitrate and in those which had a small amount of nitrate, but only a 
very small increase in the solutions which contained larger amounts 
of mineral nitrate. The methyl glycocoll produced a stunted 
growth and a peculiar twisting and lateral growth of the top of the 
plant, as before noted. There was a 25 per cent decrease in growth 
from the control cultures. 
Effect of calcium carbonate on the action of methyl glycocoll 
An experiment was made to study the effect of methyl glycocoll 
under alkaline conditions. In this case 11 nutrient solutions were 
i 
Fic. 4.—Effect of glycocoll and methyl] glycocoll on wheat plants in a nutrient 
solution containing 8 ppm. P,0;, 22 ppm. NH;, and 48 ppm. K,O; no. 1, nutrient 
solution; no. 2, same with glycocoll; no. 3, same with one glycocoll and c alcium 
car : 
used, as in the experiment just recorded; one set of 11 was used as a 
control; another set contained glycocoll; and a third set methyl 
glycocoll with calcium carbonate. The physiological effect of the 
methyl glycocoll, in solutions with calcium carbonate, was the same 
as in the solutions already discussed. The effect of both the 
