The end (of Book 1) is in sight!  No. 33 (No. 30 in the Cornopub edition), is another test of flexibility and accuracy over large intervals.  Suggested tempo is eighth note=88 for the Adagio sections, and quarter note=108+ for the Allegro sections. Finding a suitable place to breath in the final Allegro can be tough, but it is possible to grab a quick breath where necessary in order to finish the last line strongly. In The Horn Handbook, Verne Reynolds describes another great way to practice this one.

No. 33 uses the same notes again and again, with only a little relief in the middle section. We could pencil in changes of transposition every two measures in preparation for playing the Prelude to the third act of Lohengrin by Richard Wagner. [p. 61]