The leaves of this tree are its main distinguishing mark, being about eight inches long and about six inches broad, and heart-shaped. The tree grows to a height of from thirty to forty feet. It is only found in a really wild state in China, but exists in a semi-wild state widely scattered over Europe and Asia, and is found sparingly all over the United States. It was first introduced into this country for the purpose of feeding the silk-worm, but it has never proved of practical value. At the time of the silk-worm craze in 1830 the white mulberry took a big boom, but has since gradually sunk down into utter insignificance. It may, however, at some future period, arise to eminence as food for the silk-worm.