. Carnegie Institution of Washington publication. On the Nervous System of Cassiopea Xamachana. 135 The results from the 40 disks recorded in table 1 are shown in figure 6, in which the divisions along the abscissa show the time of regenera- tion in days, those along ordinate the amount of regeneration measured hi millimeters. The record for each specimen is carried to the time of closure of the open circle in the center of the disk by the sheet of regenerated tissue. From the start of regenera- tion the new tissue produced from the side with its sense- organs intact is shown to be more rapid.
. Carnegie Institution of Washington publication. On the Nervous System of Cassiopea Xamachana. 135 The results from the 40 disks recorded in table 1 are shown in figure 6, in which the divisions along the abscissa show the time of regenera- tion in days, those along ordinate the amount of regeneration measured hi millimeters. The record for each specimen is carried to the time of closure of the open circle in the center of the disk by the sheet of regenerated tissue. From the start of regenera- tion the new tissue produced from the side with its sense- organs intact is shown to be more rapid. In the early stage of regeneration this difference is more striking upon a cursory examination than in the later stages, al- though the actual difference 6 on the rate of growth of new tissue changes only slightly during the entire period of regeneration. The proportion between the amounts of new tissue formed each day, taking the amount regenerated from the side without sense- organs as the unit, was re- spectively : First day 1; second day 1; third day 1; fourth day 1; fifth day 1 The regeneration from the half without sense-organs is more regular, as is shown by the fact that for the mean of each day's observation the probable error is less for that half than for the one upon which the sense-organs remain. This result would be expected to follow from the fact that the inactive side was relieved from the influence of the marginal sense- organs, which would introduce many stimuli of varying intensity, all of which would have either a retarding or accelerating influence upon the processes of regeneration. When the rates of regeneration of certain disks in table 1 are com- pared with one another, the cause of the uncertainty of the results obtained in experiments with entire disks is clearly shown. The. 0 I £ 3 4- 5 FIG. 6.—Showing relative rates of regeneration of the halves of 40 disks. The upper line represents the half-disks with sense-organs, t
Size: 1202px × 2079px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorcarnegie, bookcentury1900, bookdecade1900, bookyear1902
