Archive image from page 24 of The culture of pot-plants in. The culture of pot-plants in rooms, greenhouses, & frames cultureofpotplan00davi Year: greenhouses ( POT-PLANTS IN ROOMS 13 chlorophyll, and are converted into the sap. Certain atmospheric conditions are therefore essential for healthy development—a sufficiency of carbonic acid gas in the air (and about this there need never be any doubt); moisture ; no interference with the functions of the stomata; sunlight; and, of course, a suitable temperature. Fig. 5.—Portion of Epidermis of Leaf (highly magnified), showing two stomata open
Archive image from page 24 of The culture of pot-plants in. The culture of pot-plants in rooms, greenhouses, & frames cultureofpotplan00davi Year: greenhouses ( POT-PLANTS IN ROOMS 13 chlorophyll, and are converted into the sap. Certain atmospheric conditions are therefore essential for healthy development—a sufficiency of carbonic acid gas in the air (and about this there need never be any doubt); moisture ; no interference with the functions of the stomata; sunlight; and, of course, a suitable temperature. Fig. 5.—Portion of Epidermis of Leaf (highly magnified), showing two stomata open and one closed. In a room, especially when it is situated in a large town, it is not easy to satisfy these conditions perfectly; but if the plants are to remain healthy, every effort should be made to do so. Dust and dirt are most injurious. They settle on the leaves and, if allowed to remain, block the stomata, and so prevent the entrance of the necessary carbonic acid, with the result that the leaves turn yellow and wither. Cleanliness is therefore essential. It is a good plan to take advantage of a shower of rain and to stand the plants out
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