. Botany all the year round; a practical text-book for schools. Botany. 90 SEEDS AND SEEDLINGS 4. Is there any nourishment in the embryos, apart from the endo- sperm ? 5. What is bran? 6. Why will hogs fatten in a pine thicket in autumn? DICOTYLEDONS Material. â Dry and soaked seeds of the common bean, cotton, and castor bean. Where cotton can not be obtained, okra, maple, ash, morning-glory, or any other convenient specimens may be used, pro- vided they are selected so as to show both the albuminous and the ex- albuminous structure. Squash, pumpkin, horse-chestnut, etc., also make good studie
. Botany all the year round; a practical text-book for schools. Botany. 90 SEEDS AND SEEDLINGS 4. Is there any nourishment in the embryos, apart from the endo- sperm ? 5. What is bran? 6. Why will hogs fatten in a pine thicket in autumn? DICOTYLEDONS Material. â Dry and soaked seeds of the common bean, cotton, and castor bean. Where cotton can not be obtained, okra, maple, ash, morning-glory, or any other convenient specimens may be used, pro- vided they are selected so as to show both the albuminous and the ex- albuminous structure. Squash, pumpkin, horse-chestnut, etc., also make good studies. Beans should be put to soak from 12 to 24 hours before used ; cotton about 48 ; squash and pumpkin from 3 to 5 days, and very hard seeds like the okra, castor bean, and morning-glory from 7 to 10. If such seeds are clipped before soaking, that is, if a small piece of the coat is chipped away from the end opposite the scar, they will soften more quickly. Keep them in a warm place with an even temperature till just before they begin to sprout, when the con- tents become softened. Very brittle cotyledons may be softened quickly by boiling them for a few minutes. 121. Examination of Some Typical Seeds. â Take a bean from the pod, noticing carefully its point of attachment. Lay it on one side and sketch it, then turn it over and draw the narrow edge that was attached to the pod. Notice the rather large scar (commonly called the eye of the bean) where it broke away from the point of attachment. Label this in your drawing, hilum. Just below the hilum, look for a minute round pore like a pin hole. Label this micropyle. Compare a soaked bean with a dry one; what difference do you perceive .? How do you account 205, side view; 206, rhaphai for the change in size and hardness â " '^ic^p'y'r'"^ 'â '"""â "â Fi"dth6 hilum and the micropyle in the soaked bean. Make a section through the long diameter at right angles to the flat sides, press it sHght
Size: 1786px × 1399px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectbotany, bookyear1903
