He shook his head. "Go read your own book then. It won't do you any good to read mine, when half the spells are explained in the first year book, and then aren't elaborated on further in this one. All the principles you could possibly want are in there."
He regarded his brother for a moment longer, wondering what house he was going to wind up in. He assumed Slytherin, but ... well, there was always a chance, wasn't there, he'd wind up somewhere else? A Potter had wound up in his house, so maybe Aries would wind up in Gryffindor.