. Elementary biology; an introduction to the science of life. Biology. CHAPTER LXVIII PROTECTIVE MOVEMENTS 406. Contractions. Contraction under stimulation is a com- mon thing among living beings. When the ameba is disturbed. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Gruenberg, Benjamin C. (Benjamin Charles), 1875-1965. Boston New York [etc. ] Ginn and company

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