Image from page 32 of "Elements of Philippine agriculture" (1908)
Title: Elements of Philippine agriculture
Contributing Library: The Library of Congress
Digitizing Sponsor: Sloan Foundation
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THE SEED 1^ seeds is the coconut. Tlie Big Trees of California have seeds so small that 500,000 of them weigh only one kilo- gram ; but a tree grown from one of these seeds may weigh a thousand tons. Fii;. II. Squash seed Study of Squash Seed. Examine a squash seed, noting its shape. Draw the seed. In tfie sharper end is a small hole, the micropyle. Carefully remove the testa, or outer coat. The thin, greenish inner coat, the tegmen, may then be seen. Remove the teg- men ; what is left is the embryo. Its sharper end is the radicle. Two fleshy cotyledons make up the most of the embryo ; they are attached to the up- per end of the radicle. Between the cotyledons, at the base, is a small, triangular structure, growing on the top of the radicle ; this is the plumule. Germinate squash seeds on moist paper, or in sand or sawdr.st. What part is first to come out of the seed? Where does it come out? In what di- rection does it grow? Plant some of the seeds in sand, sawdust, or eartli. What parts appear first above the surface ? Try to germinate seeds under water; what happens? Let the sand in which some are germi- nating become dry ; what happens ? Study of the Bean. Study a bean in the same way. Are the seed coats separable? Is the embryo straight? Do the cotyledons of all seeds appear above the ground? Study of Coconut Seed. Remove the husk and hard shell of the coconut; what remains is the seed. The seed coats are thin and inconspicuous. The meat of the coco- fic. 13. Ger- nut, which, when dried, is copra, is a part of the en- '"'"^'"S ^^" dosperm ; the water inside the meat is also a part of the endosperm. Embedded in the meat, under one of the three eyes, is the embryo. Split it. The end next the shell is the radicle. The other end is the
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Fiu. 12. Germinating squash seed
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