. Carnegie Institution of Washington publication. l86 THE BEHAVIOR OF LOWER ORGANISMS. Among the sweeping statements that one finds current in regard to the behavior of these low organisms is one to the effect that the Protist does not avoid an obstacle in its path. This statement is made for example by Ziehen, in his excellent Leitfaden der physiologischen Psychologic.* It is worth while, therefore, to describe in connection with the reactions to mechanical stimuli just how Amoeba avoids an obstacle. Let us take a concrete case. An Amreba creeping with a broad, flat anterior end came in conta
. Carnegie Institution of Washington publication. l86 THE BEHAVIOR OF LOWER ORGANISMS. Among the sweeping statements that one finds current in regard to the behavior of these low organisms is one to the effect that the Protist does not avoid an obstacle in its path. This statement is made for example by Ziehen, in his excellent Leitfaden der physiologischen Psychologic.* It is worth while, therefore, to describe in connection with the reactions to mechanical stimuli just how Amoeba avoids an obstacle. Let us take a concrete case. An Amreba creeping with a broad, flat anterior end came in contact at the middle of its anterior edge with the end of a long filament of some sort (Fig. 69). The particular spot touched (c) ceased to move forward, becoming entirely quiet (reaction to a weak mechanical stimulus). On each side of it motion continued as before, so that after a time the filament projected into a notch in the middle of the anterior edge. Then gradually the. 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 Carnegie Institution of Washington. Washington, Carnegie Institution of Washington
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