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Another of these useful productions which also suffers from a heavy duty is Cocoa or Chocolate. There are a great many different plants called Co Co, or by some name very similar to it. The Cocoanut Palm furnishes not only the nuts but the fibre or coir enclosing them, as well as a great many other useful substances. The _cocaine_ used by dentists, and which deadens or stupefies the nerves of the teeth, is derived from the leaves of a Peruvian shrub, "Coca" (_Erythroxylan Coca_). These leaves are chewed in the mouth and have very extraordinary effects, especially on the Indian labourers. They are a strong nerve stimulus and take away any feeling of hunger or fatigue. It was by the use of coca leaves that the postmen of the Inca emperors in Peru were enabled to carry messages at the rate of 150 miles a day. Then again the Cocoes of the West Indian Islands is a sort of Yam (_Colocasia antiquorum_). Coco-de-mer is the fruit of a palm common in the Seychelles Islands (_Lodoicea Seychellarum_).