Archive image from page 14 of The culture of pot-plants in. The culture of pot-plants in rooms, greenhouses, & frames cultureofpotplan00davi Year: greenhouses ( POT-PLANTS IN ROOMS 3 form. It cannot absorb solid matter. It has nothing corre- sponding to the mouth and channels by which food is conveyed to the digestive apparatus in an animal, there to be prepared for distribution throughout the system. The food materials must be dissolved in water, so that they can be absorbed by the tips of the roots, from which they pass into the various cells through the cell walls until they reach Fig.
Archive image from page 14 of The culture of pot-plants in. The culture of pot-plants in rooms, greenhouses, & frames cultureofpotplan00davi Year: greenhouses ( POT-PLANTS IN ROOMS 3 form. It cannot absorb solid matter. It has nothing corre- sponding to the mouth and channels by which food is conveyed to the digestive apparatus in an animal, there to be prepared for distribution throughout the system. The food materials must be dissolved in water, so that they can be absorbed by the tips of the roots, from which they pass into the various cells through the cell walls until they reach Fig. I.—Plant (left) recently moved from larger pot ; another (right) lifted from the ground ; and a third (centre) which has been grown in the same pot for some time. the leaves. There, under the influence of light, and with the addition of carbonic acid obtained from the air, they are transformed into sap, which is real plant food, the material of growth. Water is therefore essential, but the amount varies with the species and with the season. Some species—aquatics and subaquatics—can live in water; others, the majority, are killed if there is too much. Their roots cannot grow or continue in a healthy condition without air, and if the soil is sodden the interstices between its particles are filled with
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