Bui. 1239, U. S. Dept. of Agricultur 
Plate I 
Fig. 
Plants from Seed Sown March 15, Photographed March 25. 
The upper row consists of plants grown from machine-threshed seed. The lower row represents 
plants grown from hand-threshed seed. The pots from left to right are: 1, Untreated check; 
2, seed immersed 15 minutes; 3, 30 minutes; 4, 1 hour; 5, 2 hours; 6, 3 hours; 7, 5 hours. Note 
difference in stand and vigor. 
Fig. 2. — The Same Cultures Photographed 13 Days Later. 
The effect of the formaldehyde on the vigor of the piants grown from machine-threshed seed is 
still apparent, though there is evident recovery as growth progresses. 
WHEAT PLANTS GROWN FROM SEED TREATED WITH A I TO 
320 SOLUTION OF FORMALDEHYDE, 
