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1. "Corni in Es" is the Horn in Eb. All notes will sound a major sixth lower than written.
2. Older orchestral horn and trumpet parts frequently omitted key signatures, since the instrument had no valves and therefore could not play outside of the harmonic series. "Trombe in C" is a Trumpet in C, and it will sound exactly as written. "Clarinetti in B" is the Clarinet in Bb, the notes will sound a major second lower than written.
3. See #1 above.
4. Most likely the basses are doubling the cellos. If the basses are to drop out, there will be some sort of text indication that states that.
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