The Locust is the fruit of the Carob tree (Ceratonia siliqua), a tree that grows naturally in many parts of the South of Europe, the Levant, and Syria, and is largely cultivated for its fruit.[148:1] These are like Beans, full of sweet pulp, and are given in Spain and other southern countries to horses, pigs, and cattle, and they are occasionally imported into England for the same purpose. The Carob was cultivated in England before Shakespeare's time. "They grow not in this countrie," says Lyte, "yet, for all that, they be sometimes in the gardens of some diligent Herboristes, but they be so small shrubbes that they can neither bring forth flowers nor fruite." It was also grown by Gerard, and Shakespeare may have seen it; but it is now very seldom seen in any collection, though the name is preserved among us, as the jeweller's carat weight is said to have derived its name from the Carob Beans, which were used for weighing small objects.

The origin of the tree being called Locust is a little curious. Readers of the New Testament, ignorant of Eastern customs, could not understand that St. John could feed on the insect locust, which, however, is now known to be a common and acceptable article of food, so they looked about for some solution of their difficulty, and decided that the Locusts were the tender shoots of the Carob tree, and that the wild honey was the luscious juice of the Carob fruit. Having got so far it was easy to go farther, and so the Carob soon got the names of St. John's Bread and St. John's Beans, and the monks of the desert showed the very trees by which St. John's life was supported. But though the Carob tree did not produce the locusts on which St. John fed, there is little or no doubt that "the husks which the swine did eat," and which the Prodigal Son longed for, were the produce of the Carob tree.

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