72 TRANSACTIONS OF THE TEXAS ACADEMY OF SCIENCE. 
plant had been trying to reach more congenial depths. SS is surface of 
soil constantly lowered by erosion. 
In Fig. 2 is shown a plant in which the descent of the bulb is evidenced 
in a remarkable manner. When I carefully removed the soil from the 
lower side of the bulb I was surprised to find a root running upward along 
the bulb and stem over three inches (9 c.m.) and within less than one- 
half inch (1.5 c.m.) of the surface, extending outward over three inches 
(9 c.m.) to the point where I had broken it off in removing the soil. When 
the root A began its growth, the bulb B must have been at C, and the 
surface of the soil at DD, instead of SS, as it was when the plant was 
examined. 
