Regeneration . union. The pieces then pinch apart and producetwo hydras.^ In another experiment the head and a part of the footwere cut from a hydra, and the head was turned around and graftedby its aboral surface upon the aboral surface of the middle animal was cut in two in the middle, and the posterior halfwas grafted by its oral end to the oral end of the middle piece. In ^ For references to the literature on grafting in plants see Vochting (84).2 In one case they separated only after three months. 159 i6o REGENERATION this way a new, artificial individual was made, as shown
Regeneration . union. The pieces then pinch apart and producetwo hydras.^ In another experiment the head and a part of the footwere cut from a hydra, and the head was turned around and graftedby its aboral surface upon the aboral surface of the middle animal was cut in two in the middle, and the posterior halfwas grafted by its oral end to the oral end of the middle piece. In ^ For references to the literature on grafting in plants see Vochting (84).2 In one case they separated only after three months. 159 i6o REGENERATION this way a new, artificial individual was made, as shown in Fig. 46, C,with the middle part of the body in a reverse direction as comparedwith the orientation of the two end-pieces.^ The union of the threepieces was so perfect that not even a swelling or a constriction indi-cated the places of fusion. After six days a normal bud appeared atthe region of union of the posterior and middle pieces, that gaverise to a new hydra, which separated after a few days. The com-. FlG. 46. — A. Two posterior pieces of liydra united by their oral ends. B. Two anterior piecesof hydra united by their aboral ends. C. A long hydra made by uniting three pieces ; themiddle piece reversed. D. After Peebles. Two posterior pieces of brown hydra united byoral ends, and one cut off near union. A new anterior end developed from the cut, aboral sur-face, i^ After Peebles. Union of a nutritive and a protective polyps of hvdractinia. Subse-quently former cut off at line, i-i. E. Union of two posterior pieces of hydra by oral one piece cut off at line, 2-2. £i. New head regenerated in region of union,and a foot from aboral cut-end. E^, E^. Fusion of two parts with a single hydra. pound animal was healthy and ate many daphnias. It was kept underobservation for twenty-four days, and appeared normal, giving offseveral more buds. In other experiments of this same sort a foot generally developedwhere the two aboral surfaces came together, and the h
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