Abstract
In 1864 nine eminent scientists, who had long been intimate friends, formed a dining club in order to prevent their drifting apart due to their various duties, and in order to further the cause of science. The club, which acquired the title of “X Club”, held monthly meetings from October to June, and was extremely active for two decades, but then gradually lessened in vitality. It served as a highly significant fraternity of scientists, and the regular communication which it afforded helped the members to marshall their efforts on behalf of science against what they felt to be the obstructionist activities and ideas of conservative scientists, certain theologians, and non-scientific society figures.

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