The question, like the question, whose are you? is a question of property, and the an

Strictly speaking, I am, properly speaking, I am, is a personal pronoun, of the first person, in the singular number, and, consequently, of the same value, in all respects, as I…

I am a horse, belonging to a circle of friends, who have resolved to bear you on the back, at the rate of eight miles a figure-circle, and to deliver you safely within the limits…