290 
F. C. NEWCOMBE AND ETTA A. BOWERMAN 
Zea mais (yellow dent) seedlings were set in these cabinets just 
as the plants were breaking through the earth. In the agitated air 
were i6 seedlings, in quiet air 17 seedlings. After 6 days, 4 plants 
in each cabinet had fallen over. The plants in quiet air averaged a 
little taller than those in moving air. No other differences could be 
detected. Ten days after the beginning of the test, all plants in 
moving air had fallen over, and all but one in quiet air had fallen over. 
The average height of the 16 plants in moving air was 27 cm.; of the 
17 in quiet air, 29 cm. Of the plants in moving air, 5 had 3 leaves 
and II had 2 leaves each; of those in quiet air, 5 had 3 leaves and 12 
had 2 leaves each. No other differences could be seen between the 
two sets of plants. 
For the sake of comparison with the two foregoing groups of plants, 
a third set of 15 Zeas was run at the same time under small zinc 
cylinders in one of the cabinets. At the end of the 6-day period, 
II of the 15 had fallen over, compared with 4 in each of the other sets. 
At the end of the 10 days, all 15 plants had fallen over. The average 
height of these was 37 cm. compared with 27 and 29 cm. respectively 
in the other two groups; and of the plants under the zinc covers, 
10 had 3 leaves and 5 had 2 leaves, there being thus twice as many 
with 3 leaves each as in each of the other two groups. These com- 
parative results bring out strongly the effect of excessive moisture 
induced by a small confined space. 
None of the falling of the plants noted above was due to damping 
off. 
Fagopyrum esculentum seedlings were placed in the dark cabinets, 
4 pots in each, with 10 seedlings in each pot, seedlings grown in the 
greenhouse to a height of 2 to 5 cm. The temperature was 23° C. 
in each cabinet, the air agitated in one, quiet in the other. 
After 6 days, 29 of the 40 seedlings in quiet air and 33 of the 40 
in moving air had fallen over. Thus there were 7 erect in moving air 
and II erect in quiet air. The number of dead seedlings was about 
the same in each group. As the experiment progressed during the 6 
days, no certain difference in general behavior could be observed. 
The small difference noted above is probably not significant; another 
test might reverse relations. 
Lupinus albtis seeds were planted in whitewood (Liriodendron) 
sawdust, from which 38 seedlings grew in one pot and 46 in the other. 
When the first seedlings appeared above the sawdust, the pots were 
removed to the two dark cabinets, one pot in moving, the other in 
V 
