645. Rapidity Of Growth

Rapidity Of Growth. The temperature of the room in which the specimens are kept will have much to do with the progress made in the development of the seed germ. The amount of daily growth will be the factor governing the intervals between making of photographic records. Instead of making the exposures every day, it may be thought more advisable to do so every other day. A photographic record made every day will, however, show a certain amount of development.

Illustration No. 115

Botanical Studies - Development of Seed Germ

See Paragraph 642

Illustration No. 116

Botanical Studies - Development of Seed Germ

See Paragraph 648

Illustration No. 117

Botanical Studies - Development of Seed Germ

See Paragraph 648

Illustration No. 118

Botanical Studies - Development of Twig

See Paragraph 650

Illustration No. 119

Botanical Studies - Development of Twig

See Paragraph 650

646. Care should always be exercised that the seeds are in the same relative positions when making each record. After the sprout has become 1/4 inch long it will, however, alter the position of the seed. Fig. No. 2 of Illustration No. 115, shows the seed after it has swollen and the germ started to grow; Fig. 3 is the next stage, then Fig. 4. In the latter view the seeds have been intentionally placed in different positions so as to show various views of the subjects.

647. At the end of the first week test tubes should be placed in a rack, or a convenient support, and filled with water. The root sprout of the seed is then placed in the water. The seed being of sufficient size, it will find a support on the edge of the test tube. If a regular test tube rack is not at hand, small holes can be cut in the side of a pasteboard box and the test tubes inserted in these. (See Fig. 5, Illustration No. 115.)

648. The three views shown in Illustration No. 116 (Figs. 6, 7 and 8), further demonstrate the rapid growth, also the sudden changes which take place during the progress of the plant's development. Following these we have the views shown in Figs. 9, 10 and 11 of Illustration No. 117. The series of eleven views cover a period of a plant's ordinary growth, under natural conditions, during a period of two weeks.