There are some persons who are of too fastidious a turn of mind to like anything long, or to assent twice to the same opinion. ---- always sets himself to prop the falling cause, to nurse the rickety bantling. He takes the part which he thinks in most need of his support, not so much out of magnanimity, as to prevent too great a degree of presumption or self-complacency on the triumphant side. 'Though truth be truth, yet he contrives to throw such changes of vexation on it as it may lose some colour.' I have been delighted to hear him expatiate with the most natural and affecting simplicity on a favourite passage or picture, and all the while afraid of agreeing with him, lest he should instantly turn round and unsay all that he had said, for fear of my going away with too good an opinion of my own taste, or too great an admiration of my idol--and his own. I dare not ask his opinion twice, if I have got a favourable sentence once, lest he should belie his own sentiments to stagger mine. I have heard him talk divinely (like one inspired) of Boccaccio, and the story of the Pot of Basil, describing 'how it grew, and it grew, and it grew,' till you saw it spread its tender leaves in the light of his eye, and wave in the tremulous sound of his voice; and yet if you asked him about it another time, he would, perhaps, affect to think little of it, or to have forgotten the circumstance. His enthusiasm is fickle and treacherous. The instant he finds it shared in common, he backs out of it. His enmity is equally refined, but hardly so unsocial. His exquisitely-turned invectives display all the beauty of scorn, and impart elegance to vulgarity. He sometimes finds out minute excellences, and cries up one thing to put you out of conceit with another. If you want him to praise Sir Joshua _con amore_, in his best manner, you should begin with saying something about Titian--if you seem an idoliser of Sir Joshua, he will immediately turn off the discourse, gliding like the serpent before Eve, wary and beautiful, to the graces of Sir Peter Lely, or ask if you saw a Vandyke the other day, which he does not think Sir Joshua could stand near. But find fault with the Lake Poets, and mention some pretended patron of rising genius, and you need not fear but he will join in with you and go all lengths that you can wish him. You may calculate upon him there. 'Pride elevates, and joy brightens his face.' And, indeed, so eloquent is he, and so beautiful in his eloquence, that I myself, with all my freedom from gall and bitterness, could listen to him untired, and without knowing how the time went, losing and neglecting many a meal and hour,