. Comparative physiology of the brain and comparative psychology. Brain; Psychology, Comparative. EXPERIMENTS ON WORMS Si pieces containing brain and eyes, the reaction be- gan about one minute after exposure to light; in the pieces without brain, after about five minutes. In this experiment, only diffused daylight was employed as a stimulus. In a round dish with vertical sides, the Planarians do not collect, like strictly heliotropic ani- mals, on the window- or room-side of the dish, but on the right and left sides. Decapitated Planarians be- have in the same way. All these reactions occur t
. Comparative physiology of the brain and comparative psychology. Brain; Psychology, Comparative. EXPERIMENTS ON WORMS Si pieces containing brain and eyes, the reaction be- gan about one minute after exposure to light; in the pieces without brain, after about five minutes. In this experiment, only diffused daylight was employed as a stimulus. In a round dish with vertical sides, the Planarians do not collect, like strictly heliotropic ani- mals, on the window- or room-side of the dish, but on the right and left sides. Decapitated Planarians be- have in the same way. All these reactions occur the day after the operation. Fresh material should always be used for these experiments. After what has been said, it is hardly necessary to mention that pieces of Planaria torva from which. the brain has been removed right themselves as well as normal animals. According to some authors, the starfish represents a colony of as many individuals as it has arms. We have seen that these react har- moniously as long as the nervOUS FIG. 24. TWO-HEADED connection is uninterrupted. In Actinians that have been made two- headed artificially, this harmony no longer exists ; for instance, in taking food both heads struggle for the same piece of meat. At my suggest- ion, Dr. van Duyne tried to produce multi-headed Planarians artificially. He succeeded in making them with as many as six heads. Fig. 24 shows a PLANARIAN PRODUCED ARTIFICIALLY. (After van Duyne.). 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 Loeb, Jacques, 1859-1924. New York, G. P. Putman's Sons; [etc. , etc. ]
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