WiiORLED Milkweed 
29 
Fig.. 21 — Plot I. A. June 1918 at start of experiment. B. 
August 1919 after being sprayed with salt solution. 
No milkweed present. 
of 8 to 10 inches. The trench was dug back a foot or sixteen inches 
from the outermost green shoot to insure getting beyond the 
rootstocks creeping underground. This method of procedure 
