Both Uses of

authentic
in
Middlemarch

Against certain facts he was helpless: against Will Ladislaw's existence, his defiant stay in the neighborhood of Lowick, and his flippant state of mind with regard to the possessors of authentic, well-stamped erudition: against Dorothea's nature, always taking on some new shape of ardent activity, and even in submission and silence covering fervid reasons which it was an irritation to think of: against certain notions and likings which had taken possession of her mind in relation to subjects that he could not possibly discuss with her.†
Chpt 4 *

And let it not be supposed that opinion at the Tankard in Slaughter Lane was unimportant to the medical profession: that old authentic public-house—the original Tankard, known by the name of Dollop's—was the resort of a great Benefit Club, which had some months before put to the vote whether its long-standing medical man, "Doctor Gambit," should not be cashiered in favor of "this Doctor Lydgate," who was capable of performing the most astonishing cures, and rescuing people altogether given up by other practitioners.†
Chpt 5

Definition:

real or true