Manito eBooks

181. Chenopodieae. XXVII. CHENOPODIALES.
202. Euphorbiaceae. XXXII. EUPHORBIALES.
211. Cupuliferae. XXXVI. QUERNALES.
212. Corylaceae. DITTO
Sub-class II.--Gymnosperms.
223. Coniferae.
224. Cycadeae.
Class II.--MONOCOTYLEDONS.
2. Cannaceae. II. AMOMALES.
34. Liliaceae. XI. LILIALES.
41. Asparageae. DITTO
55. Gramineae. XV. GLUMALES.
SUB-KINGDOM II.--Cryptogamic Plants.
1. Filices. I. FILICALES.
6. Lycopodiaceae. DITTO
[page 69]
Radicles.--In all the germinating seeds observed by us, the first change is
the protrusion of the radicle, which immediately bends downwards and
endeavours to penetrate the ground. In order to effect this, it is almost
necessary that the seed should be pressed down so as to offer some
resistance, unless indeed the soil is extremely loose; for otherwise the
seed is lifted up, instead of the radicle penetrating the surface. But
seeds often get covered by earth thrown up by burrowing quadrupeds or
scratching birds, by the castings of earth-worms, by heaps of excrement,
the decaying branches of trees, etc.


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