. Elementary botany . Fig. 51- Leaf of coleus showing green and white areas, before treatment with iodine. Fig. 52. Similar leaf treated with iodine, the starch re- action only showing where the leaf was green. plant m which it is easy to test for the presence of starch. Pin a piece of circular cork, which is smaller than the area of the leaf, on either side of the leaf, as in fig. 53. Place the plant where it will be in the sunlight. On the afternoon of the following day, if the sun has been shining, we may remove the corks and test for starch, using the entire leaf, by Schimper's method. Or
. Elementary botany . Fig. 51- Leaf of coleus showing green and white areas, before treatment with iodine. Fig. 52. Similar leaf treated with iodine, the starch re- action only showing where the leaf was green. plant m which it is easy to test for the presence of starch. Pin a piece of circular cork, which is smaller than the area of the leaf, on either side of the leaf, as in fig. 53. Place the plant where it will be in the sunlight. On the afternoon of the following day, if the sun has been shining, we may remove the corks and test for starch, using the entire leaf, by Schimper's method. Or ^^ ^^Eir*^ the method described in 146 I<1R-53, , Mg-54- may be employed. The part Leaf of tropaeolum Leaf of tropaeolum treated - . , " with portion covered with iodine alter removal of covered by the cork Will not with corks to prevent cork, to show that starch is re- . , „a/,f;„ +- ^.,,.,.k theformationotstareh. moved from the leaf during the give the reaction tol Starch, (After night. as shown by the absence of the bluish color, while the other parts of the leaf will show it. The starch which was in that part of the Km! the day before was dissolved and removed
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Keywords: ., bookcentury1800, bookdecade1890, bookpublisher, booksubjectbotany
