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LEFT HA-HA BAY 441 HAHNEMANN employed by the Chinese government to study the gold, lead and silver mines in northern China. In 1879, when the United States established the geological survey, he accepted a place in that bureau. His publications include "The Volcanoes of California, Oregon, and Washington Territories"; "The Volcanic Rocks of the Great Basin" (1884) ; "On the Development of Crystallization in the Igneous Rocks of Washoe" (1885) ; "Nevada, with Notes on the Geology of the District" (1885) ; "Atlas of the Yel- lowstone National Park" (1904), etc. of the uselessness, but also of the in- jurious character of the prevailing methods of treatment. Six years of study and investigations proved to him that in all instances the medicine which had cured produced a very similar condition in healthy persons to that it had re- lieved. This conclusion he published in an essay in "Hufeland's Journal" in 1796. It is in this essay that the principle of similiu similibus curantur (similar things are cured by similar things) is first put forward by him, not as a theory but as a fact. His views at once met THE HAGUE PEACE PALACE HA-HA BAY, an inlet of Saguenay river, in Chicoutimi eo., Quebec, Canada, midway between Lake St. John and the St. Lawrence river; known also as Grande Bay. It is connected with Great and Little Ha-Ha Lakes by the Ha-Ha river; the bay is about 7 miles long, 1 mile wide, and 600 feet deep. HAHNEMANN, CHB,ISTIAN FRIEDRICH SAMUEL (ha'ne-man) , the founder of Homceopathy {q, v.) ; born in Meissen, Saxony, April 10, 1755. He entered the University of Leipsic at the age of 20; from Leipsic he proceeded to Vienna for clinical study; he then passed two years as physician and Kbrarian to a nobleman residing in Tran- sylvania; after which he entered and, in 1779, graduated at the University of Erlangen. During the following 10 years he practiced medicine and held sev- eral public appointments in Dresden and elsewhere, and then settled in a small village near Leipsic. His observation and practice had convinced him, not only with vehement opposition. Apothecaries refused to dispense his prescriptions, and he was forced to give his medicine to his patients free of charge. This was an infringement of the privileges which German law had conferred on the apothe- caries, and hence he was prosecuted in every town in which he attempted to settle from 1798 till 1810, when he re- turned to Leipsic. Two years afterward he was appointed a privat-docent of the university. At Leipsic he remained till 1821, when a successful prosecution by the apothecaries drove him from the city. Under the protection of the Duke of Anhalt-Kothen he retired to Kothen, where he became a center of attraction to numerous invalids in all parts of the world. He became known as one of the earliest advocates of hygiene. His book entitled "The Friend of Health" (1792) proves him to have been far in advance of his time in preventive medicine. Equally so was he in the treatment of the insane. He was also the author of sev- eral valuable papers on chemistry. He