The Manx Society for the Publication of National Documents, or simply the Manx Society, was a text publication society founded in February 1858 with the objective of publishing reprints of historical documents relating to the Isle of Man, its people and culture. Over its lifetime the society published 33 volumes of documents, the last appearing in 1893. The society was formally wound up in 1907.
More information on the Wikipedia page [1] and also here [2].