cf. De Sp. S. § 25, p. 17.  On those who described the Spirit as merely a ministering spirit, vide Athan., Ad Serap. i. (λεγόντων αὐτὸ μὴ μόνον κτίσμα, ἀλλὰ καὶ τῶν λειτουργικῶν πνευμάτων ἓν αὐτὸ εἶναι).  This new party arose in the Delta about 362, and was first known as “Tropici.”  They were condemned at the synod held at Alexandria on the return of Athanasius from his third exile.  Its Synodical Letter is the Tomus ad Antiochenos.