_Quid est Episcopus_ (Vol. v., p. 177.).--This passage does not, as X.
G. X. thinks, come from Irenæus, but from St. Austin. I find the
reference to it in Bingham's _Antiquities_ (vol. i. p. 72. ed. 1843),
where the whole passage is thus quoted at the foot of the page:
"Quid est episcopus, nisi primus presbyter, id est, summus
sacerdos?"--_Aug. Quæst. Vet. et N. Test._ c. ci.