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the formation of new cells, and the increase in size of the old ones, and in the various movements of the plant. [Footnote 1: See page 13.] [Footnote 2: This table illustrates the differences between the processes. ASSIMILATION PROPER. RESPIRATION. Takes place only in cells Takes place in all active cells. containing chlorophyll. Requires light. Can proceed in darkness. Carbonic acid absorbed, Oxygen absorbed, carbonic oxygen set free. acid set free. Carbohydrates formed. Carbohydrates consumed. Energy of motion becomes Energy of position becomes energy of position. energy of motion. The plant gains in dry The plant loses dry weight. weight. Physiological Botany, page 356.] [Transcriber's Note: Two footnote marks [3] and [4] above in original text, but no footnote text was found in the book] This process of growth can take place only when living _protoplasm_ is present in the cells of the plant. The substance we call protoplasm is an albuminoid, like the white of an egg, and it forms the flesh of both plants and animals. A living plant can assimilate its own protoplasm, an animal must take it ready-made from plants. But a plant can assimilate its food and grow only under the mysterious influence we call life. Life alone brings forth life, and we are as far as ever from understanding its nature. Around our little island of knowledge, built up through the centuries by the labor of countless workers, stretches the infinite ocean of the unknown. _Gray's First Lessons_. Sect. VII, XVI, sec. 2, sec. 4, sec. 5, sec. 6, 476-480. _How Plants Grow_. Chap. I, 119-153, Chap. III, 261-280. ***END OF THE PROJECT GUTENBERG EBOOK OUTLINES OF LESSONS IN BOTANY, PART I; FROM SEED TO LEAF*** ******* This file should be named 10726.txt or 10726.zip ******* This and all associated files of various formats will be found in: http://www.gutenberg.net/1/0/7/2/10726 Updated editions will replace the previous one--the old editions will be renamed. Creating the works from public domain print editions means that no one owns a United States copyright in these works, so the Foundation (and you!) can copy and distribute it in the United States without permission and without paying copyright royalties. Special rules, set forth in the General Terms of Use part of this lic
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