Fig. 35. Curve of regenerative growth in tadpoles’ tails. (From M. L. Durbin’s data.)
have been an intervening “latent period,” during which no growth occurred, between the time of injury and the first measurement of regenerative growth;
Fig. 36. Mean daily increments, corresponding to Fig. [35].
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or, for all we yet know, regeneration may have begun at once, but with a velocity much less than that which it afterwards attained. This apparently trifling difference would correspond to a very great difference in the nature of the phenomenon, and would lead to a very striking difference in the curve which we have next to draw.
The curve already drawn (Fig. [35]) illustrates, as we have seen, the relation of length to time, i.e. L ⁄ T = V. The second (Fig. [36]) represents the rate of change of velocity; it sets V against T;
| Days | Total increment | Daily increment | Logs of do. |
|---|---|---|---|
| 1 | — | — | — |
| 2 | — | — | — |
| 3 | 1·40 | ·60 | 1·78 |
| 4 | 2·00 | ·52 | 1·72 |
| 5 | 2·52 | ·45 | 1·65 |
| 6 | 2·97 | ·43 | 1·63 |
| 7 | 3·40 | ·32 | 1·51 |
| 8 | 3·72 | ·30 | 1·48 |
| 9 | 4·02 | ·28 | 1·45 |
| 10 | 4·30 | ·22 | 1·34 |
| 11 | 4·52 | ·21 | 1·32 |
| 12 | 4·73 | ·19 | 1·28 |
| 13 | 4·92 | ·18 | 1·26 |
| 14 | 5·10 | ·17 | 1·23 |
| 15 | 5·27 | ·13 | 1·11 |
| 16 | 5·40 | ·14 | 1·15 |
| 17 | 5·54 | ·13 | 1·11 |
| 18 | 5·67 | ·11 | 1·04 |
| 19 | 5·78 | ·10 | 1·00 |
| 20 | 5·88 | ·10 | 1·00 |
| 21 | 5·98 | ·09 | ·95 |
| 22 | 6·07 | ·07 | ·85 |
| 23 | 6·14 | ·07 | ·84 |
| 24 | 6·21 | ·08 | ·90 |
| 25 | 6·29 | ·06 | ·78 |
| 26 | 6·35 | ·06 | ·78 |
| 27 | 6·41 | ·05 | ·70 |
| 28 | 6·46 | ·04 | ·60 |
| 29 | 6·50 | ·03 | ·48 |
| 30 | 6·53 | — | — |
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