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Rh would have been pretty sure to occur to him that he owed his sister a letter before it was too late for writing it.

They made a hasty visit to the church, which is by far the finest religious edifice in Vienna, and may be said to stand in the very heart of the city. Fred had previously made a note of the fact that the church is more than seven hundred years old, and has been rebuilt, altered, and enlarged so many times that not much of the original structure remains. On the first day of their stay in Vienna the youths had climbed to the top of the building and ascended the spire, from which they had a magnificent

view of the city and the country which surrounds it. The windings of the Danube are visible for many miles, and there are guides ready at hand to point out the battle-fields of Wagram, Lobau, and Essling. Our young friends had a good-natured discussion about the height of the spire of St. Stephen's; Frank claimed that his guide-book gave the distance from the ground to the top of the cross four hundred and fifty-three feet, while Fred contended, on the authority of another guide-book, that it was four hundred and sixty-five feet. Authorities differ considerably as to the