452. Miscellaneous Intelligence. 
the radicle and the plumula have a diametrically opposite” 
manner of feeling the influence of this external cause, since 
they act in a manner diametrically opposite under its influence.’ 
M. Dutrochet regards this phenomenon as perfectly analo- 
gous to that which, in natural philosophy, is called polarization. 
It may be said that a body offers the phenomena of polarization 
when two of its parts, situated’ diametrically opposite to each 
other, possess opposite properties ; and it is this which exists 
with regard to the radicle and the plumula of seminal embryos. 
The same may be stated with regard to the leaves of vege- 
tables, of which the two opposite faces are polarized inversely 
one to the other. M. Dutrochet has assured himself of the 
truth of this last fact, by submitting stalks furnished with 
leaves to continual rotation. The leaves turned their upper 
surfaces towards the centre of rotation, and consequently their 
lower surfaces towards the circumference. Thus the upper 
surface of leaves is polarized as the plumula, the lower surface 
as the radicle. 
The general result of these observations is, that the direction 
of the radicle towards the centre of the earth, and of the plu- 
mula upwards, arises from this, that the obedient pole of the 
little plant, z.e., the radicle, obeys the tendency of gravitation, 
and that the re-acting pole of the plant, or the plumula, re-acts 
against the same tendency. 
The direction of the upper faces of leaves, and of stems in 
general, towards the light, arises from the circumstance that 
these parts being the seat of the re-acting pole, direct themselves 
by that alone, in the direction opposed to that of the light 
itself. The lower surfaces of leaves, like the radicle, flies from 
the light, z. e., they move in the same direction as the light, 
being the seat of the obedient pole. 
The facts referred'to in these conclusions are good, but we 
will leave it to our readers to determine, whether the explanation 
given of them is any thing more than a play upon words. 
8. Trifolium Incarnatum.—The professor of agriculture in 
the university of Modena strongly recommends a species of 
clover, that has net hitherto been cultivated in this country, 
namely, the trifolium incarnatum, or crimson clover. He re- 
commends it as the earliest of trefoils; as the most useful for 
increasing forage; as-requiring only one plowing and harrow- 
ing to cover the seed; as peculiarly calculated for dry soils, 
even gravels; and as preferring the mountain to the plain. It 
is so hardy that it may be sown even in autumn, and it stands 
severe frosts well. If sown in spring it will yield a good crop 
that year.—New Mon. Mag. 
9. Green Ore of Uranium.—Mr. Phillips has ascertained 
