458 
IOWA ACADEMY OF SCIENCE Vol. XXIV, 1917 
The most interesting thing about the conditions on the levee 
last summer, however, was the start that was being made toward 
a second re-vegetation of the upper end of the levee, which 
had been denuded by grading operations early in the year. 
Only a scattering stand of plants made their appearance during 
the summer. Of these, the dominant was not the lettuce, which 
held first place elsewhere on the area, but Amaranthus retro- 
flexus, the dethroned and exiled monarch of the first season ! 
It would rather seem as though the whole cycle were about to 
repeat itself. 
Scripps Institution for Biological Research, 
La Jolla, California. 
