apheliotropic

Apheliotropic, a-fē-li-o-trop′ik, adj. turning away from the sun.

Apheliotropic movements are comparatively rare in a well-marked degree, excepting with sub-aërial roots.

The radicles of Sinapis alba, when immersed in water and exposed to a lateral light, bend from it, or are apheliotropic.

Of the 54 cauterised radicles one case was doubtful, 25 curved themselves from the light in the normal manner, and 28, or more than half, were not in the least apheliotropic.

In September, 39 cauterised radicles were exposed to a northern light, being kept at a proper temperature; and now 23 continued to be apheliotropic in the normal manner, and only 16 failed to bend from the light.