[Vol. I.](http://openlibrary.org/works/OL7647056W "Horæ Apocalypticæ, Vol. I.") [Vol. II.](http://openlibrary.org/works/OL13700466W "Horæ Apocalypticæ, Vol. II.") [Vol. III.](http://openlibrary.org/works/OL10687292W "Horæ Apocalypticæ, Vol. III.") [Vol. IV.](http://openlibrary.org/works/OL13700464W "Horæ Apocalypticæ, Vol. IV.") The eschatological study *Horae Apocalypticae* (Hours with the Apocalypse) is doubtless the most elaborate work ever produced on the Apocalypse. Without an equal in exhaustive research in its field, it was occasioned by the futurist attack on the Historical School of interpretation. Begun in 1837, its 2,500 pages are buttressed by some 10,000 invaluable references to ancient and modern works. It ran through five editions (1844, 1846, 1847, 1851 and 1862).