. Senescence and rejuvenescence. Age; Reproduction. THE RECONSTITUTION OF ISOLATED PIECES "S susceptibility of the headless forms falls below that of the whole animals, but later rises considerably above it. This is simply an expression of the fact that there is no part of the headless piece which has as high a rate of metaboKsm as the head-region of the whole animal, but that the rate in the headless piece is considerably higher than that of the regions of lowest rate in the whole animal. It is also evident from Fig. 25 that the difference between normal Stages., vv V 1 \ II III IV. Hour
. Senescence and rejuvenescence. Age; Reproduction. THE RECONSTITUTION OF ISOLATED PIECES "S susceptibility of the headless forms falls below that of the whole animals, but later rises considerably above it. This is simply an expression of the fact that there is no part of the headless piece which has as high a rate of metaboKsm as the head-region of the whole animal, but that the rate in the headless piece is considerably higher than that of the regions of lowest rate in the whole animal. It is also evident from Fig. 25 that the difference between normal Stages., vv V 1 \ II III IV. Hours 1234567 Fig. 25.—Susceptibility of Planaria dorolocephala to KCN mol. after different degrees of reconstitution: unbroken line, uninjured animals like those from which pieces were taken; short dashes, normal forms after reconstitution; long dashes, teratophthalmic forms; alternate long and short dashes, anophthalmic forms; dots, headless forms. and teratophthalmic forms is slight and much less than that between teratophthalmic and anophthalmic forms. These curves are a graphic presentation in dynamic terms of the degree of rejuvenescence in its relation to the degree of recon- stitution. Similar tests of the susceptibiHty of the different reconstitutional forms have been made repeatedly with pieces of different size and from different regions of the body and always with essentially the same 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 Child, Charles Manning, 1869-1954. Chicago, Ill. , The University of Chicago Press
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectreproduction, bookyea
