between different races, as we shall presently see there are between the two sexes, in regard to the epochs of acceleration of growth, in other words, in the ãphaseã of the curve.
It is evident that, if we pleased, we might represent the rate of change of acceleration on yet another curve, by constructing a table of ãsecond differencesã; this would bring out certain very interesting phenomena, which here however we must not stay to discuss.
| Increment | ô ô ô ô | Increment | ||||
|---|---|---|---|---|---|---|
| Age | Male | Female | ô ô ô ô | Age | Male | Female |
| 0ã1ã | 5ôñ9 | 5ôñ6 | ô ô ô ô | 12ã13 | 4ôñ1 | 3ôñ5 |
| 1ã2ã | 2ôñ0 | 2ôñ4 | ô ô ô ô | 13ã14 | 4ôñ0 | 3ôñ8 |
| 2ã3ã | 1ôñ5 | 1ôñ4 | ô ô ô ô | 14ã15 | 4ôñ1 | 3ôñ7 |
| 3ã4ã | 1ôñ5 | 1ôñ5 | ô ô ô ô | 15ã16 | 4ôñ2 | 3ôñ5 |
| 4ã5ã | 1ôñ9 | 1ôñ4 | ô ô ô ô | 16ã17 | 4ôñ3 | 3ôñ3 |
| 5ã6ã | 1ôñ9 | 1ôñ4 | ô ô ô ô | 17ã18 | 4ôñ2 | 3ôñ0 |
| 6ã7ã | 1ôñ9 | 1ôñ1 | ô ô ô ô | 18ã19 | 3ôñ7 | 2ôñ3 |
| 7ã8ã | 1ôñ9 | 1ôñ2 | ô ô ô ô | 19ã20 | 1ôñ9 | 1ôñ1 |