[13032] in linux-announce channel archive
Explore Nature, On An African Safari
daemon@ATHENA.MIT.EDU (Luxury Safaris)
Tue May 12 22:01:41 2015
To: <linuxch-announce.discuss@charon.mit.edu>
Date: Tue, 12 May 2015 22:01:40 -0400
From: "Luxury Safaris" <LuxurySafaris@jyftpyx.eu>
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<a target="" href="http://www.jyftpyx.eu/l/lt1Q10036SA204TG/209HJ1057MG67084IJ305P130895471X2159117872" id="subj"> Explore Nature, On An African Safari </a>
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<p align="center" style="font: 15px;">cuticle, and by having the outer walls 9fdaba190ace50880dc4155f29cb9a3e 9fdaba190ace50880dc4155f29cb9a3e of its cells unlike the inner walls.† Especially significant is the structure of such intermediate types
as the Liverworts. Beyond the differentiation of the covering<B>cells from the contained cells, and the contrast between upper surface and under EISJCBGCR</B>
surface, the frond of Marchantia polymorpha clearly shows us the direct effect of incident forces; and SCJ SUFYQ shows us, too, how it is involved with the
effect of 9fdaba190ace50880dc4155f29cb9a3e inherited proclivities. The frond grows from a flat disc-shaped gemma, the two sides of which are alike. Either side may fall uppermost;
and then of the developing shoot, the side exposed to the light “is under all circumstances the upper side which forms stomata, the dark UPM side becomes
the under side which produces root-hairs and leafy processes.”‡ So that while we have undeniable proof that the contrasted influences 9fdaba190ace50880dc4155f29cb9a3e of the medium
on the two GRBKCEOE sides, initiate the differentiation, we have also proof that the completion of it is determined by the transmitted structure of the type;
since it is impossible to ascribe the development of stomata to the direct action of air and light. On turning from foliar expansions, to stems and 9fdaba190ace50880dc4155f29cb9a3e
roots, facts of like meaning meet us. Speaking generally of epidermal tissue and inner tissue, Sachs remarks that “the contrast of the two is the DCIKKDV
plainer<u>the more the part of the plant MGCPYWT concerned is exposed to air and light.”§ Elsewhere, in correspondence with 9fdaba190ace50880dc4155f29cb9a3e this, it is said that in</u>roots
the cells of the epidermis, though distinguished by bearing hairs, “are otherwise similar [447] to those of the fundamental 9fdaba190ace50880dc4155f29cb9a3e tissue” which they
clothe,* while the cuticular covering is relatively thin; whereas in stems the epidermis (often further differentiated) is composed of layers of KRQQRJ
cells which 9fdaba190ace50880dc4155f29cb9a3e are smaller and thicker-walled: a stronger contrast of structure corresponding 9fdaba190ace50880dc4155f29cb9a3e to a stronger contrast of conditions. By way of
meeting the suggestion that these respective differences are wholly due<b>to the natural selection of favourable variations,</b>it will suffice if I draw NJXT
attention to the unlikeness between imbedded roots and exposed roots. While in darkness, and surrounded by moist earth, the outermost protective coats, 9fdaba190ace50880dc4155f29cb9a3e
even of large roots, are 9fdaba190ace50880dc4155f29cb9a3e comparatively thin; but when the accidents of growth entail permanent exposure to light and air, roots acquire coverings
allied in character to the coverings of branches. That the action of the medium causes these and converse changes, 9fdaba190ace50880dc4155f29cb9a3e cannot be doubted when we find,
on the one hand, that “roots can become 9fdaba190ace50880dc4155f29cb9a3e directly transformed into leaf-bearing shoots,” and, on the other hand, that in some plants certain
“apparent roots are only underground shoots,” and that nevertheless “they are similar to true roots in function and in the formation of tissue, but BBG
have no root-cap, and, when they come to the light above ground,<I>continue to grow in the manner DFUJKWR of ordinary leaf-shoots.Ӡ If, then,</I>in highly
developed plants inheriting 9fdaba190ace50880dc4155f29cb9a3e pronounced structures, this differentiating influence of the medium is so marked, it must have been all-important at
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