0. C. CHARLTON ERYTHRONIUM BULBS. 
71 
nearer edge of the rock, while several were bent backward, as though the 
bulb had been dragged past them. Evidently the greater number of 
roots had reached the edge of the rock and dragged the bulb after them, 
from the position A to. the position B. The soil over the rock was more 
shallow than that normally over Erythronium bulbs, and plainly the 
