But this reaching but to the things of their common interest and property, leaves the wife in the full and free possession of what by contract is her peculiar right, and gives the husband no more power over her life than she has over his; the power of the husband being so far from that of an absolute monarch, that the wife has in many cases a liberty to separate from him, where natural right, or their contract allows it; whether that contract be made by themselves in the state of nature, or by the customs or laws of the country they live in; and the children upon such separation fall to the father or mother's lot, as such contract does determine.