Here it is.
Then she (Lucy) came to a page which was sucha blazw of pictures that one hardly noticed the writing. Hardly –but she did notice the first words. There were, An infallible spell to make beautiful her that uttereth beyond the lot of mortals. Lucy peered at the pictures with her face close to the page, and though they had seemed crowded and muddlesome before, she found she could now see them quite clearly. The first was a picture of a girl standing at a reading desk reading in a huge book. And the girl was dressed exactly like Lucy. In the next picture Lucy (for the girl in the picture was Lucy herself) was standing up with her mouth open and a rather terrible expression on her face, chanting or reciting something. In the third picture the beauty beyond the lot of mortals had come to her. It was strange, considering how small the pictures had looked at first, that the Lucy in the picture now seemed quite as big as the real Lucy; and they looked into each other's eyes and the real Lucy looked away after a few minutes because she was dazzled by the beauty of the other Lucy’ though she could still see a sort of likeness to herself in that beautiful face. And now the pictures came crowding on her thick and fast. She saw herself throned on high at a great tournament in Calormen and all the Kings of the World fought because of her beauty.