** David Chin **:
The first effort of a sprouting seed is to send a root down into the soil
** David Chin **:
Germinating seeds produce roots before they send a shoot up into the air
** David Chin **:
Specimen plants for study
** David Chin **:
To show how water gets into the roots of plants. Water passed up into the egg through the skin, or membrane, and forced the contents up the glass tube until it began to overflow.
** David Chin **:
Radish seeds sprouted on dark cloth. To show root hairs.
** David Chin **:
To show where growth in length of the root takes place. Forty hours before the photograph was taken the tip of the root was ¼ inch from the lowest thread. The glass cover was taken from this in order to get a good picture of the root.
** David Chin **:
A corn-plant ten days after planting the seed. To show how quickly the roots reach out into the soil. Some of the roots were over 18 inches long.
** David Chin **:
A plow stopped in the furrow, to show what it does to the roots of plants when used for after-cultivation. Notice the point of the plow under the roots.
** David Chin **:
Soy-bean roots showing location, extent and depth of root-growth.
** David Chin **:
Sweet potato roots. The great mass of the roots is in the plowed soil. Many of them reach out 5 to 7 feet from the plant. Some reach a depth of more than 5 feet, and others come to the very surface of the soil.
** David Chin **:
A sweet-potato root producing new plants.
** David Chin **:
A radish root, from which the stored food has been used to help produce a crop of seeds.
** David Chin **:
To show that plant-roots take food from the soil. Both boxes were planted at the same time.
** David Chin **:
To show that plant-roots take water from the soil, the plants in A are suffering from thirst. B has sufficient water.
** David Chin **:
To show osmose
** David Chin **:
To show that roots need air. Bottle A was supplied with fresh water, and bottle B with water that had been boiled to drive the air out and then cooled.
** David Chin **:
Bottle A contains fresh water, bottle B contains boiled water. Notice the air bubbles in bottle A.
** David Chin **:
Tumblers A and C contained moist sand, B and D contained puddled clay. Cuttings in B and D died, because there was not sufficient ventilation in the clay for root-development.