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H = Orgaan van Jacobson

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Ludwig Lewin Jacobson (1783 – 1843) was a Danish surgeon.

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It was, however, in the field of comparative anatomy that Jacobson won his reputation. 

In 1809 Jacobson announced to the Danske Videnskabernes Selskab his rediscovery of and researches concerning a hitherto unknown absorptive organ in the human nose (later named after him "the Jacobsonian organ"). 

This discovery at once placed Jacobson in the front rank of the biologists of his age. The Danish society of sciences awarded him a silver medal of honor; he was given military rank as a regimental surgeon, and was granted a royal stipend to enable him to travel through Germany and France.

Jacobson was created a knight of the Danebroge in 1829, and he received the silver cross of the same order in 1836. He was also honored with decorations from several foreign potentates. 

In spite, however, of all the flattering recognition that he received, Jacobson felt depressed because he as a Jew was barred from the University of Copenhagen. A professorship had been offered him on the condition that he embrace Christianity, but he refused to abandon the faith of his fathers. 

His religious belief prevented also his accepting a special invitation to attend the first meeting of natural scientists to be held in Christiania (Oslo) in 1822, because at that time the edict forbidding Jews to stay in Norway was still in force. In 1840, he was elected a foreign member of the Royal Swedish Academy of Sciences. 

He died in Copenhagen in 1843.