. Principles of plant culture; an elementary treatise designed as a text-book for beginners in agriculture and horticulture. Horticulture; Botany. Germination. 27 flay or loam, put 25 A'iable beans on tlie soil in each saucer, then fill one saucer with moist sand and the other with puddled clay or loam, pressing the latter down very closely around the beans, cover both saucers with a bell- jar, and xjlace in a warm room for two or three days, we shall find that the l)eans co\'ered with the sand will sprout promptly, while those covered with the puddled soil will not (Fig. 4). In the sand-cover
. Principles of plant culture; an elementary treatise designed as a text-book for beginners in agriculture and horticulture. Horticulture; Botany. Germination. 27 flay or loam, put 25 A'iable beans on tlie soil in each saucer, then fill one saucer with moist sand and the other with puddled clay or loam, pressing the latter down very closely around the beans, cover both saucers with a bell- jar, and xjlace in a warm room for two or three days, we shall find that the l)eans co\'ered with the sand will sprout promptly, while those covered with the puddled soil will not (Fig. 4). In the sand-covered saucer the. Fif^. -J. In the left haiijcl saucer beans wei'e planted in puddled soil. In the other, tliey were covered with sand. They failed to germinate in the puddled soil, because their contact with oxygen was cutoff. {From nature). air bet\A"een the grains of sand has had access to the beans, while in the othei' the air has been shut out, which explains the sprouting of one lot of seeds and the failure of the other. About one-fifth of the atmosphere is free oxygen, i. e., oxygen that is not chemically combined with any other substance. AVe have seen that jprotoplasm in its active state re- quires oxygen (13). Unless seeds are so planted that a certain amount of this free oxygen can reach them they cannot germinate.* Ordinary water contains a little free oxygen, but not enough to enable many kinds of seeds to germinate in it, though the seeds of some water plants, as the water lily and rice will germinate in water. But even these will not germinate in water that has been * This probably explains why very deeply-planted seeds rarely germi- 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 Goff, E. S. (Emmett Stull), 1852-1902. Madison, Wis. , The Author
Size: 3026px × 826px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., book, bookcentury1800, booksubjectbotany, booksubjecthorticulture
