The dollhouse and rocking horse of old Miss Ashemeade (rumored to be a witch) are by no means the usual playthings of little girls. That's the point behind Andre Norton's new book, "Octagon Magic." From these "toys," eleven-year-old Lorrie Mallard is mentally transported to a forgotten time in the home's history. The mini-adventures Lorrie experiences serve moral lessons applicable to the real world of the new student in town.