. PHYSIOLOGY. . 261 
Bulbs, consisting of scales or concentric coats, 
(§ 43, 1,:2..3.), Dave at their base a fleshy bottom, 
from the extremity of which radicles and new bulbs 
shoot forth. This consists of a net-like plexus of 
vessels, which is not circular as in other roots. 
. Plants change their original habitation, and, in 
common with animals, move from one place to 
another. The creeping roots run forth under 
ground, the branch from which the new shoot 
arose dies, and the young root now becomes at- 
tached to a distant spot. The palmate and testi- 
cular root, (§ 11. g. 4), consist, as we saw before, 
-of two knobs, one of which completely dries up, 
when on the opposite side a new one is formed. 
This happens every year, and the plant in this way, — 
after many years, appears on a quite different spot. 
Solid bulbs, (§ 43. 4.), especially the bulb of the 
Colchicum autumnale, undergo the same change; 
on the side of the old bulb a new one appears, the 
old one decays, and the whole at last becomes at- 
tached to a place, distant from that where it formerly 
stood *. 
§ 255. 
Very remarkable, and deserving particular atten- 
tion is the choice of food, which has been observed 
* ‘The premorse root, (§ 11. 6.), is in the beginning per- 
pendicular, After the first year the perpendicular root he- 
comes ligneous, and on its sides new branches shoot out. The 
old main root must therefore decay, and it really putrifies, 
and owes to this particular circumstance its peculiar figure. 
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