“May I beg you to express to the liberal but unknown donor of the picture of the death of Lorenzo de’ Medici by Fuseli, my most grateful acknowledgments for his very acceptable present; which will now be more valuable to me than ever, as, independently of the estimation in which I hold it on account of the subject and the painter, it will call to mind an act of generosity, which, although I am not permitted to acknowledge it to the giver, will always afford me the sincerest pleasure as having been the object of such an instance of disinterested kindness.
“Please to communicate the contents of this to the proper quarter, and to believe me,” &c.