380 BOTANICAL GAZETTE [MAY 
in the sugar solution made little or no growth, others grew well 
(fig. 2). These roots which showed little growth lowered the average 
for the lengths in the sugar solutions. The maximum growth in 
glucose of a root tip originally 1.5 cm. long was 13.5 cm. with 
Fic. 2.—(1) Root tips of pea grown in dark in Pfeffer’s solution plus 2 per cent 
glucose; () plus 2 per cent levulose; (3) plus no carbohydrate; (4) corn root tips 
grown in Pfeffer’s solution plus 2 per cent levulose; (5) plus no carbohydrate; (6) plus 
2 per cent glucose. 
thirteen side roots, in levulose of a root tip originally 2.6 cm. the 
maximum growth was 7.5 cm. with nine secondary roots. 
The general appearance of the pea roots was not entirely normal. 
The brownish color, especially noticeable in the levulose solutions, 
and the failure of some of the roots in the sugar solution to make 
much growth while others grew fairly well, suggest that the sterili- 
