. A practical course in botany, with especial reference to its bearings on agriculture, economics, and sanitation. Botany. 44 PRACTICAL COURSE IN BOTANY WTiat changes have the cotyledons undergone in the suc- cessive seedlings? Remove from the earth a seedling just beginning to sprout and sketch it. From what point does the hypocotyl protrude through the coats ? Does this agree with its position as sketched in your study of the seed? In which part of the embryo does the first growth take place ? Remove in succession the several seedlings you have sketched and note their changes. How does the r
. A practical course in botany, with especial reference to its bearings on agriculture, economics, and sanitation. Botany. 44 PRACTICAL COURSE IN BOTANY WTiat changes have the cotyledons undergone in the suc- cessive seedlings? Remove from the earth a seedling just beginning to sprout and sketch it. From what point does the hypocotyl protrude through the coats ? Does this agree with its position as sketched in your study of the seed? In which part of the embryo does the first growth take place ? Remove in succession the several seedlings you have sketched and note their changes. How does the root differ from that of the corn and oats ? The first root formed by the extension of the hypocotyl is the primary root and should be so labeled in your drawings; the branches that spring from it are secondary roots. Look for root hairs; if there are any, where do they occur? 43. Germination of the squash. — How does the manner of breaking through the soil compare with that of the bean?. Fig. 59. — Stages in the germination of a typical seedling of the squash family : u, a seed before germination ; b, c, e, the same in different stages of growth ; d, the empty testa, with kernel removed ; hi, hilum ; m, micropyle ; p, p, the peg in the heel; h, h, h, the hypocotyl; ar, arch of the hypocotyl; co, cotyledons; pi, plumule; pr, primary root; sc, secondary roots. With the corn? From which end of the seed, the large or the small one, does the hypocotyl spring ? Do the cotyledons come above ground ? How do they get out of the seed coat ? Notice the thick protuberance developed by the hypocotyl and pressing against the lower half of the coat at the point where the hypocotyl breaks through. This is called the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Andrews, Eliza Frances, b. 1840; Lloyd, Francis Ernest,
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