the Wikisource 1911 Encyclopedia Project

This project has not been endorsed by Encyclopædia Britannica Inc., any of its agents, editors, or subsidiaries. We do not reference to the trademark Encyclopædia Britannica®, but we strictly acknowledge the original title of this material, which has gone into the Public Domain due to the expiration of the copyright of this material. Any use of the term Encyclopædia Britannica® should be confined strictly to this usage. This document is based upon the knowledge available in 1911 and may be inaccurate — especially in the areas of medicine, science and ethnography. Readers should only use the information as an historic reference.

DO NOT USE IT FOR MEDICAL GUIDANCE.

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