Mast, Samuel Ottmar, 1871- · New York : J. Wiley & Sons · leaf 143
sity is decreai, d without any changeof ray direction there is no response; but if it is increasedthey respond in one of two different ways, depending uponthe amount of increase. If the increase is relatively slightthey merely swerve more strongly toward the oral side; andsince this side always… … Flo. 14. Stentor ooeruleus in the process of orientation. The cnived linerepresents the spiral course; the arrows m and n the direction of light from twosources; a-J, different positions of Stentor on its course; 0, the oral surface; ab, the■bond surface. At a the Stentor is oriented in light from…
Light · Phototropism
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