Returning to New-York, in 1835, he published _Four Years in Great Britain_, in two volumes, which were soon after reprinted, with some additions, in a more popular form. In 1836 he gave to the public anonymously, _Protestant Jesuitism_, a criticism of the constitution, extreme opinion, and unwise action of many of the benevolent and religious societies; and having taken orders in the Episcopal church, _Thoughts on the Religious State of the Country, and Reasons for preferring Episcopacy_, a work which was much read and the cause of much critical observation in Great Britain as well as in the United States. From that time Mr. Colton has written very little on any subject intimately connected with religion, but directing his attention to public affairs, has been as conspicuous in the state as he was previously in the church. In 1838 he published _Abolition a Sedition_, and _Abolition and Colonization Contrasted_, in which he contended with equal earnestness and ability that the entire subject of slavery is beyond the limits of the proper action of the national government, and that there is no justification of its discussion, except in the states where slavery is established, or for the wise and really philanthropic purpose of promoting African Colonization. In 1839 he again took up the argument of our social relations with Great Britain, in a work written in Philadelphia, but published in London, under the title of _A Voice from America to England, By an American Gentleman_. The plan was judicious: it was not so much to express opinions as to state facts which should compel opinions in the adverse audience he addressed. While mainly defensive, he was at the same time bravely critical. He contended that in its constitution our government was republican and not democratic, but that the extraordinary force of public opinion among us has made it democratic in fact. A large portion of the work was devoted to the several ecclesiastical polities existing here, which he treated with singular freedom and originality, so that the frequent impertinences of ignorant laymen and obtrusively-meddling women, in the affairs of churches, rendering the clerical profession humiliating and difficult to a person of manly character and cultivation, were stated without any hesitation or attempt at concealment. The entire performance is still attractive for frequent sound observation upon institutions, judicious criticism of manners, happy illustration, and good humor, and its opportune appearance was advantageous to the best fame of the country.