. Foundations of botany. a b c d e Fit;. IGl. — Pollen Grains. (Very greatly magnified.)a, pumpkin ; b, enchanters nightshade ; c, Albuca ; (/, pink ; e, hibiscus. the spots at which the inner coat of the grain is finallyto burst through the outer one, pushing its way out inthe form of a slender, thin-walled tube.^ 224. The Formation of Pollen Tubes. — This can bestudied in pollen grains which have lodged on the stigmaand there been subjected to the action of its moist is, however, easier to cause the artificial production ofthe tubes. EXPERIMENT XXXVIII Production of Pollen Tubes.
. Foundations of botany. a b c d e Fit;. IGl. — Pollen Grains. (Very greatly magnified.)a, pumpkin ; b, enchanters nightshade ; c, Albuca ; (/, pink ; e, hibiscus. the spots at which the inner coat of the grain is finallyto burst through the outer one, pushing its way out inthe form of a slender, thin-walled tube.^ 224. The Formation of Pollen Tubes. — This can bestudied in pollen grains which have lodged on the stigmaand there been subjected to the action of its moist is, however, easier to cause the artificial production ofthe tubes. EXPERIMENT XXXVIII Production of Pollen Tubes. — Place a few drops of suitably dilutedsyrup with some fresh pollen in a concave cell ground in a micro-scope slide; cover with thin glass circle ; place under a bell-glass,with a wet cloth or sponge, to prevent evaporation of the syrup, andset aside in a warm place, or merely put some pollen in syrup in a 1 See Kerner and Olivers Natural History of Plants, Vol. II, pp. 95-104. FERTILIZATION 213 watch crystal under
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