the tips of eleven radicles within the same jars, and five of them became plainly curved away from this side. In the former case the bend was abrupt, as shown in Fig. 15; in the latter a greater length of radicle
seemed to be affected and the curve was symmetrical, as seen in Fig. 16. He says, "It was a striking spectacle, showing the difference in the sensitiveness of the radicle in different parts, to behold in the same
jar one set of radicles curved away from the squares on their tips, and another set curved toward the squares attached a little higher up."
His experiments upon the radicles of dicotyledons were numerous and varied in every way; but the seeds of Indian corn were the only