The Magic World by Edith Nesbit

This collection includes, "The Cat-hood of Maurice", "The Mixed Mine", "Accidental Magic", "The Princess and the Hedge-Pig", "Septimus Septimusson", "The White Cat", "Belinda and Bellamant", "Justnowland", "The Related Muff", "The Aunt and Anabel; "Kenneth and the Carp" and "The Magician's Heart"