Mast, Samuel Ottmar, 1871- · New York, J. Wiley · leaf 185
on the spiral course in the samedirection, and this results in orientation. The larvae how-ever, having two eye-spots, can turn toward the source oflight in two positions in the spiral, whereas the Euglcnaecan turn toward it in only one. If one were to imagine twoEuglenae united so as to form an… … I n Fig. 26. I. Arenicola lar\-a in the frce-swimminR state, proceeding; on a spiralcourse, m, n, directions of light; a-h, diflerent positions on the spiral; b, dorsalsurface up, right eye-spot toward n; d, ventral surface up, left eye-spot toward n.If the ray direction is changed by…
Light -- Physiological effect · Phototropism
Internet Archive · Public Domain Mark 1.0. Free to use for anything.
