The common reason why parents thrust their daughters into nunneries is that they may not be overburdened with too numerous a family; but the ancients had a method almost as innocent and more effectual to that purpose—viz., the exposing their children in the earliest infancy. This practice was very common, and is not mentioned by any author of those times with the horror it deserves, or scarce​[53] even with disapprobation. Plutarch—the humane, good-natured Plutarch​[54]—recommends it as a virtue in Attalus, King of Pergamus, that he murdered, or, if you will, exposed all his own children in order to leave his crown to the son of his brother, Eumenes, signalising in this manner his gratitude and affection to Eumenes, who had left him his heir preferable to that son. It was Solon, the most celebrated of the sages of Greece, who gave parents permission by law to kill their children. Shall we then allow these two circumstances to compensate each other—viz., monastic vows and the exposing of children, and to be unfavourable in equal degrees to the propagation of mankind? I doubt the advantage is here on the side of antiquity. Perhaps, by an odd connection of causes, the barbarous practice of the ancients might rather render those times more populous. By removing the terrors of too numerous a family it would engage many people in marriage, and such is the force of natural affection that very few in comparison would have resolution enough to carry into execution their former intentions. China, the only country where this cruel practice of exposing children prevails at present, is the most populous country we know, and every man is married before he is twenty. Such early marriages could scarcely be general had not men the prospect of so easy a method of getting rid of their children. I own that Plutarch speaks of it as a very universal maxim of the poor to expose their children, and as the rich were then averse to marriage on account of the courtship they met with from those who expected legacies from them, the public must have been in a bad situation between them.​[55]