But it is not the sole one. Man's desire for children, wealth, authority, and the extension of bis social and political power, often prompts him to put away an unfruitful wife, or to marry another of greater worldly possessions. Among the Botis of Ladakh, should a wife prove barren, a second can be chosen; and should she only bear daughters, another can be similarly selected.* In Indo-China, polygyny is allowed only if the wife is sterile;* and the Eskimo of Prince Regent's Bay only takes a second wife if the first have given him no children.10 In China and Tonquin, however, if the wife be barren, she herself advises her husband to take a second, as Rachel did Jacob.1

* Byron's idea of constancy, therefore, to be "constantly loving somebody," seems to be founded on an innate instinct.