. Comparative physiology of the brain and comparative psychology. Brain; Psychology, Comparative. EXPERIMENTS ON MEDUSsE 27. killed the animals in order to preserve them. In other experiments, the two animals did not heal together so completely. It happened in the case where the animals had grown together most completely, as represented in Figure 5, that they contracted synchronically like one animal two days after the operation. The animals, on the other hand, that had not grown together to such an ex- tent did not contract synchro- nically. I believe that if one could succeed in healing two
. Comparative physiology of the brain and comparative psychology. Brain; Psychology, Comparative. EXPERIMENTS ON MEDUSsE 27. killed the animals in order to preserve them. In other experiments, the two animals did not heal together so completely. It happened in the case where the animals had grown together most completely, as represented in Figure 5, that they contracted synchronically like one animal two days after the operation. The animals, on the other hand, that had not grown together to such an ex- tent did not contract synchro- nically. I believe that if one could succeed in healing two hearts together completely, they would also beat synchro- nically. The assumption of a " centre of coordination" situated in the ganglia of the margin of a Medusa thus becomes un- necessary. In the frog's heart, the sinus venosus beats faster than the auricle, ven- tricle, and bulbus aortae. Hence, each contraction of the sinus venosus acts as a stimulus, which causes a contraction of the auricles, and the contraction of the latter is the stimulus which causes the contraction of the ventricle and bulbus aortae. It would follow from this that if we could cause the bulbus aortae in the frog's heart to beat as fast as the sinus venosus we FIG. 5. -o DR. HARGITT'S EX- PERIMENT. Two Gonionemi grafted to- gether. Two days after the operation synchronous con- tractions of both animals were 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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