COLLUM

(Lat. coUum, the neck.) That i art of the axis of a plant whence the stem and root diverge. In the beginning it is a space which there is no difficulty in distinguishing, so long as the embryo or young plant has not undergone any considerable change; but in the proce of time it is externally obliterated, so as to become a mere m.atter of theory. 247 COLONY. [s. 260]