De Compositione Verborum
From LSJ
Ὕπνος δὲ πάσης ἐστὶν ὑγίεια νόσου → Sopor est hominibus ipsa vitae sanitas → Genesung bringt von jeder Krankheit tiefer Schlaf
Wikipedia EN
Περὶ συνθέσεως ὀνομάτων, The Arrangement of Words, Lat. De Compositione Verborum, a treatise by Dionysius of Halicarnassus treating of the combination of words according to the different styles of oratory.