A discourse concerning old Age is a discourse to people concerning the problems and concerns of old age.
Bernard of Clairvaux (I believe he is Catholic) On Loving God is a fifteen chapter work on love, on its degrees, and various other elements of true love
Spring, Gardiner – Distinguishing Traits of Christian Character
Trotter Five Letters on Worship and Ministry in the Spirit.
Sermons on Hebrews by Alan Carr
Steele – Love Enthroned is a work on what is love, its different aspects, biblical examples, etc. 23 chs.
Gospel of the Comforter by Steele is a 36 chapter work on the Holy Spirit and different aspects of Him (1897).