SUPERFICIAL MEASURE.
| Square inch | = | 6·451366 | centimètres carrés. |
| ” foot | = | 0·0929 | mètres carrés. |
| ” yard | = | 0·836097 | ” ” |
| Rod | = | 25·291939 | ” ” |
| Rood (1,210 square yards) | = | 10·116775 | ares. |
| Acre (4,840 ” ”) | = | 40·4671 | ” |
| Square mile | = | 2·588881 | kilomètres carrés. |