Travel is a study of religious institutions. Among the most interesting in Europe, that we visited, are Wesley's Chapel, Westminster Abbey, St. Paul's Cathedral, and Notre Dame. The Church of Notre Dame, situated in the heart of Paris on the bank of the Seine, was founded 1163 on the site of a church of the fourth century. The building has been altered a number of times. In 1793 it was converted into a temple of reason. The statue of the Virgin Mary was replaced by one of Liberty. Busts of Robespierre, Voltaire, and Rosseau were erected. This church was closed to worship 1794, but was reopened by Napoleon 1802. It was desecrated by the Communards 1811, when the building was used as a military depot. The large nave, 417 feet long, 156 feet wide, and 110 feet high, is the most interesting portion of this massive structure. The vaulting of this great nave is supported by seventy-five huge pillars. The pulpit is a masterpiece of modern wood-carving. The choir and sanctuary are set off by costly railings, and are beautifully adorned by reliefs in wood and stone. The organ, with 6,000 pipes, is one of the finest in Europe. "The choir has a reputation for plain song." On a small elevation, in the center of London, stand the Cathedral of St. Paul's, the most prominent building in the city. From remains found here it is believed that a Christian Church occupied this spot in the times of the Romans, and that it was rebuilt by King Ethelbert, 610 A.D. Three hundred years later this building was burned, but soon it was rebuilt. Again it was destroyed by fire, 1087, and a new edifice begun which was 200 years in completion. This church, old St. Paul's, was 590 feet long, and had a leaden-covered, timber spire, 460 feet high. In 1445 this spire was injured by lightning, and in 1561 the building was again burned. Says Mr. Baedeker, whose guidebook is indispensable in the hands of a traveler, "Near the cathedral stood the celebrated Cross of St. Paul, where sermons were preached, papal bulls promulgated, heretics made to recant, and witches to confess, and where the pope's condemnation of Luther was proclaimed in the presence of Woolsey." Here is the burial place of a long list of noted persons. Here occurred Wyckiff's citation for heresy, 1337; and here Tyndale's New Testament was burned, 1527. It was opened for divine services, 1697, and was completed after thirteen years of steady work, at a cost of three and a half millions of dollars. This sum was raised by a tax on coal. The church is in the form of a Latin cross, 500 feet long, with the transept 250 feet in length. "The inner dome is 225 feet high, the outer, from the pavement to the top of the cross, is 364 feet. The dome is 102 feet in diameter, thirty-seven feet less than St. Peter's. St. Paul's is the third largest church in Christendom, being surpassed only by St. Peter's at Rome." Three services are held here daily. The religion of Notre Dame is Roman Catholic, but that of St.