70 
TRANSACTIONS OF THE TEXAS ACADEMY OF SCIENCE. 
tain parts of the cedar brakes just north, of Waco. Portions of this area 
are elevated perhaps 200 feet or more above the Brazos and Bosque rivers, 
next to which the ridge ends in bold cliffs, with almost vertical faces. . All 
the little valleys draining this area have steep slopes. On one of these 
slopes, where erosion of the soft limestone and the overlying stony soil 
is going on quite rapidly, I found last spring (March, 1898) that most of 
the Erythroniums gave ample evidence that they had been sinking some- 
what rapidly into the soil. On carefully digging the soil away from a 
bulb, I would find that many of its roots curved sharply upwards near the 
bulb and then continued obliquely upward and outward or horizontally 
outward from the bulb. 
Erythronium albidum. Bulb resting on flat top of rock. The bulb has been drawn by the roots 
R from the position A to the position B. S S, surface of soil. 
The bulb shown in Fig. 1 was found resting on an irregular flat- 
topped rock, about five by six inches by a greatest thickness of three and 
one-half inches. But, instead of resting upright on the rock, the bulb 
was bent into an almost horizontal position, its lower side being flat- 
tened against the rock. .Nearly all the roots extended to and over the 
