One instance of this is the opposition to investigation. A Mediums' National Defence Association was in open operation before 1890. A leading Spiritualist paper suggested in 1876, that the would-be inquirer should be "tied securely hand and foot, and placed in a strong iron cage, with a rope or small chain put tightly about his neck, and fastened to an iron ring in the wall." Early in 1897, some young men who claimed to have exposed an impostor, before a large audience in the Spiritualist Temple in Boston, were prosecuted by his admirers on the charge of having disturbed public worship. V. During the last quarter of the century, free love has been much less prominent than before in Spiritualistic teachings; but the only Americans who were able to proclaim liberty without encouraging self-indulgence, prior to 1870, were the logical and scholarly Transcendentalists. Theodore Parker, for instance, is to be reckoned among the followers of Hegel rather than of Schelling; for he tried by hard study and deep thought to build up a consistent system of religion and morality by making deductions from a few central principles which he revered as great primary intuitions, held always and everywhere sacred. His faith in his ideas of God, duty, and immortality was very firm; and he did his best to live and think accordingly. He began to preach in 1836, the year of the publication of Emerson's first book, but soon found his work hindered by an idolatry of the Bible, then prevalent even among Unitarians. Familiarity with German scholarship enabled him to teach his people to think rationally. His brethren in the Unitarian ministry were alarmed; and a sermon which he preached in Boston against the mediatorship of Jesus made it impossible for him to occupy an influential pulpit. The lectures which he delivered that year in a hall in the city, and published in 1842, won the support of many seekers for a new religion. They voted that he should "have a chance to be heard in Boston"; and on February 16, 1845, he preached in a large hall to what soon became a permanent and famous congregation.