A decade later (1876), Bradlaugh and Besant decided to republish the American Charles Knowlton's pamphlet advocating birth control, "The Fruits of Philosophy, or the Private Companion of Young Married People", whose previous British publisher had already been successfully prosecuted for obscenity. The two activists were both tried in 1877, and Charles Darwin refused to give evidence in their defence, pleading ill-health, but at the time writing to Bradlaugh that his testimony would have been of little use to them because he opposed birth control. They were sentenced to heavy fines and six months' imprisonment, but their conviction was overturned by the Court of Appeal on the basis that the prosecution had not set out the precise words which were alleged to be obscene in the indictment. The Malthusian League was founded as a result of the trial to promote birth control. He was a member of a Masonic lodge in Bolton, although he was later to resign due to the nomination of the Prince of Wales as Grand Master.