"She means Mrs. Browning," Peggy said loftily. "English isn't Mary's long suit." "No, but I can add two and two," Mary returned sharply. Peggy was as weak in mathematics as Mary was in English. Blue Bonnet finished her visit with Carita and went back to her room. She opened her desk and getting out an invitation looked it over carefully. At the top of the note-paper reposed a tiny golden lamb, and underneath, the letters A. O. O. L. formed a monogram in blue and gold. A skull and cross-bones had been drawn in ink and a message followed: "The presence of Miss Blue Bonnet Ashe is demanded at twelve o'clock to-night, February the nineteenth, at number fifteen Fifth Avenue: the said Miss Ashe to appear in a winding sheet, noiseless shoes and a bath-robe. Miss Ashe has the privilege of bringing refreshments with her if inclined; the committee suggesting that they be in keeping with the shades of night: skeleton salad, ghost sandwiches, assorted spooks or witches' delight. A roasted hobgoblin will be served soon after the meeting opens. Please be on time, and hold your honorable body in readiness for this or any other sacrifice that may be demanded by the Order. "Fraternally yours, "COMMITTEE ON INITIATION." Blue Bonnet laughed as she folded up the invitation and put it back in the desk. Her mind reverted to the time, a day or two back, when Sue Hemphill had fastened a little enameled sprig of mint--the pin of the Order--on her dress with the remark: "This means that you are now pledged to our Order. Mint is our emblem. You'll get the roast at the initiation." She stood for a moment looking out the window, her thoughts on the event before her. She wondered about the little golden lamb at the top of the note-paper--what its significance was. In regard to the refreshments she wished she had known about those sooner. If she could have had a day's notice, Huyler's could have prepared a witches' delight--ghost sandwiches that the girls would not have forgotten in a week. She remembered some April fool's candy Kitty Clark once got--the most delectable looking stuff imaginable--but, ugh! Her mouth burned yet when she thought of it. She ran across the hall and knocked softly at Annabel's door. Annabel was some time in answering. When she did, she poked her head out the tiniest bit, and Blue Bonnet saw a flash of white sheets which seemed, from her brief glance, to cover the room. "Sorry to be inhospitable, Blue Bonnet, but I can't let you in. You see you aren't expected until to-night. At twelve, remember; and, for goodness' sake, take a look down the hall before you venture out. We don't want Fraulein to spoil things. I reckon Sue had better fix up your pillow before you come." "Fix up my pillow!" Blue Bonnet said, a bit mystified. "Yes. She'll show you. She's an artist at it." Blue Bonnet's amazement deepened and Annabel explained.