and therefore more helpless than we are; and the mouse comes into the world still earlier and more inchoate, so much so that even the little marsupial is scarcely more unformed and embryonic. In all these cases alike, we must, in order to study the curve of growth in its entirety, take full account of prenatal or intra-uterine growth. {75}
According to His26, the following are the mean lengths of the unborn human embryo, from month to month.
| Months | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 (Birth) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Length in mm. | 0 | 7ôñ5 | 40 | 84 | 162 | 275 | 352 | 402 | 443 | 472 | 490ã500 |
| Increment per month in mm. | ã | 7ôñ5 | 32ôñ5 | 44 | 78 | 113 | 77 | 50 | 41 | 29 | 18ã28 |
These data link on