. A companion to Blackie's tropical readers, books I and II : containing suggestions for experiemnts and practical work . gvigorously, about 6 in. from the ground, and note the bleeding due to the escape of food in solution goingup the stem from the roots. Do not confuse withgummy matter given off by plants in order to healwounds. Expt. 18. Food Solution travels up through WoodyPortion of Stem.—Put a branch ( of a rose tree)with leaves to stand in water coloured with red in the sunlight for three or four hours. Observethat the red ink has travelled up into the leaves, and,by cut
. A companion to Blackie's tropical readers, books I and II : containing suggestions for experiemnts and practical work . gvigorously, about 6 in. from the ground, and note the bleeding due to the escape of food in solution goingup the stem from the roots. Do not confuse withgummy matter given off by plants in order to healwounds. Expt. 18. Food Solution travels up through WoodyPortion of Stem.—Put a branch ( of a rose tree)with leaves to stand in water coloured with red in the sunlight for three or four hours. Observethat the red ink has travelled up into the leaves, and,by cutting across the stem and also peeling down apiece of the bark, note that it has passed through thewoody portion of the stem only; the pith, cambiumlayer, and bark will not have been reddened. Expt. 19. Underground Stems.—Collect and make drawings of rhizomes of the ginger and iris; tubers of(C 282) 3 34 COMPANION TO TROPICAL READERS the white yam, coco (tania), and Irish potato; and ofbulbs of the onion, garlic, and red lily. Observe thatall these underground stems possess eyes or budsfrom which shoots may Fig. 12.—The Potato Plant, showing tubers Expt. 20. Edible Portion of Cassava.—Observe thatthe tuberous or fleshy root of the cassava has no buds,and is therefore a root. Expt. 21. Edible Portion of Sweet Potato.—Deter-mine by examination and experiment whether the edibleportion of a sweet potato plant is a tuber or a fleshyroot. EXPERIMENTS AND PRACTICAL WORK 35
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