[1] The club met in London once a month—except in July, August and September—from November 1864 until March 1893, and its members are believed to have wielded much influence over scientific thought.
The members of the club were George Busk, Edward Frankland, Thomas Archer Hirst, Joseph Dalton Hooker, Thomas Henry Huxley, John Lubbock, Herbert Spencer, William Spottiswoode, and John Tyndall, united by a "devotion to science, pure and free, untrammelled by religious dogmas.
According to its members, the club was originally started to keep friends from drifting apart, and to partake in scientific discussion free from theological influence.
John Tyndall, Edward Frankland and Thomas Hirst, men who became friends in the late 1840s, were artisans who became physical scientists.
Thomas Huxley, Joseph Dalton Hooker, and George Busk, friends since the early 1850s, had worked as surgeons and had become professional naturalists.
Spottiswoode, Herbert Spencer, and John Lubbock joined the circle of friends during the debates over evolution and naturalism in the early 1860s.
The publication in 1859 of Charles Darwin's book On the Origin of Species through Natural Selection brought a storm of argument, with the scientific establishment of wealthy amateurs and clerical naturalists as well as the Church of England attacking this new development.
The collection represented a summation of a nearly century-long challenge to the history and prehistory of the Bible by higher critics as well as geologists and biologists.
The members of the X network backed the collection, and Lubbock even sought to form an alliance between liberal Anglicans and scientists.
Two liberal Anglican theologians were convicted of heresy, and when the government overturned the judgement on appeal, Samuel Wilberforce, the High Church and the evangelicals organised petitions and a mass backlash against evolution.
They took their campaign to the British Association for the Advancement of Science, aiming to overthrow Huxley's "dangerous clique" of Darwin's allies.
In his analysis Colenso used mathematics and concepts of population dynamics, including examinations of food supply and transportation, to show that the first five books of the Bible were faulty and unreliable.
Outrage broke out within the Church of England, and the X network not only gave their support to Colenso, but at times even dined with him to discuss his ideas.
[11] Thus, by 1864, the members of the X Club were joined in a fight, both public and private, to unite the London scientific community with the objective of furthering the ideas of academic liberalism.
The problem with most formal societies at the time, especially to those men that would come together to form the X Club, was the manner in which meetings were conducted; most were too large and unsuitable for the discussion of private scientific matters.
In addition, due to the outbreak of debates over evolution and religion within the scientific societies of London during the 1860s, the pursuit of discussion with likeminded men was often difficult.
[14] In 1864, Huxley wrote to Hooker and explained that he feared he and his group of friends, the other men of the social network, would drift apart and lose contact.
He proposed the creation of a club that would serve to maintain social ties among the members of the network, and Hooker readily agreed.
In his description of the first meeting, Hirst wrote that what brought the men together was actually a "devotion to science, pure and free, untrammelled by religious dogmas," and he predicted that situations would arise when their concerted efforts would be of great use.
Some historians, such as Ruth Barton, feel that Huxley wanted the newly formed club to act as a guide to the development of science.