τὸν μὲν οὖν ἕτερον: sc. λόγον, i. e. the speech of Isocrates ad Nicoclem.
τὸν δ᾽ ἐχόμενον: sc. λόγον, ‘the following discourse’; cp. ἐκ τῶν ἐχομένων, E. 33 and note.
ὑπερβαλούμενος: see note on E. I ὑπερβολήν.
προσῆκον: acc. absolute—a construction usually found with impersonal verbs or verbs used impersonally in the passive, e.g. δέον, ‘it being necessary,’ προστεταγμένον, ‘it having been ordered’: ὡς is practically always added if a subject is expressed; cp. § 48 ὡς τὸ σύμπαν ἕξον.
διαμάρτοιτε τῆς ἐμῆς γνώμης, ‘you should mistake my sentiments’ (F.).
