Bab sat as quiet as a mouse, taking no part in the conversation.

Mrs. Post was a handsome woman of about fifty, who looked rather stern to the girls; but Hugh a.s.sured them that she was "dead easy," once you got on the right side of her. Her husband was a prominent lawyer in Washington, and their winters were usually spent in the capital.

Mrs. Post's gown was nearly covered by a long, light-colored chiffon wrap, with a high collar lined with a curious ornamental embroidery.

"Harry," she said, turning to the young man with her, "it is warm in here with these tropical plants; will you be kind enough to remove my wrap?"

The conservatory was dimly lighted. Barbara sat in the shadow. Between her and the party she was watching was a central row of flowers and evergreens, dividing the long room into two aisles.

She saw Harry rise and lean over Mrs. Post, who only half rose from her chair. Deftly and with wonderful ease and swiftness, Townsend undid the clasp at her throat; but, for a moment, the embroidery from the collar seemed to have caught in her hair.

Barbara's eyes grew wide and staring with surprise. As the coat slipped back from Mrs. Post's shoulders, she saw a string like a tiny green serpent glide with magic smoothness and swiftness from her throat, and drop into the shrubbery back of her, or-into Harry Townsend's hand?

What should she do? Announce that she had seen her string of emeralds disappear? Mrs. Post was talking and laughing gayly with her friend in the gold-colored dress. Harry was smiling quietly by them. Barbara rubbed her eyes. Surely she was mistaken. She had been dazzled by the wonderful sights she had seen that night. While she hesitated her opportunity pa.s.sed.

Governor Post returned, saying to his wife: "Come, my dear, I have found Miss Stuart and a friend. They have a table out in the garden, and want us to join them."

Mrs. Post again drew her wrap over her shoulders and turned to leave the conservatory. As she rose she saw Barbara.

"You there, my child?" she said in a friendly way. "Why didn't you speak to me?"

Barbara could only answer her stupidly. "I was waiting for Hugh."

When Hugh returned he found Barbara looking as pale as though she had just seen a ghost.

"What's the matter?" he asked at once. "Are you ill?"

But Bab shook her head. "I'll go find Miss Stuart," the young man suggested.

"You'll do no such thing, Hugh!" Barbara had recovered her breath.

"There's nothing much the matter with me-at least, I am not sure whether I ought to tell you."

"Bab and Hugh! Well, I like this!" Grace's voice sounded from the doorway, as she and Donald Cartwright came in, followed by Ruth and Ralph. "Here you two have run away by yourselves, when we promised to stick together this evening, in order to keep up each other's courage.

You ought to see Gladys! She's as angry as can he, and is wandering round with Mollie and the freshman. Harry has been gone somewhere for a long time, and she has no partner for the next dance."

"Are you sick, Bab?" inquired Ruth. She, too, noticed that Bab was unusually pale. Before she received an answer, Governor and Mrs. Post came into the conservatory, followed by Harry Townsend, Miss Stuart and the woman in yellow.

"You are just the fellow I want to see, Hugh," said his father, so quietly that no one except those near him could hear. "Your mother has lost her emerald necklace, and she thought she had it on when she was last in here. We don't want to create any excitement, or to let Mrs.

Erwin or the servants know until we have made a thorough search. She very probably dropped it among these flowers. Lock the door out there, will you? Miss Carter, you and Donald, please keep guard at the other door while these young people help me look."

"I thought--" said Barbara.

"Why, you were in here, child, when we were. You were on the other side of these evergreens," said Mrs. Post. "What did you say?"

"I thought it might be in these evergreens," Barbara finished, lamely, getting down on her knees to a.s.sist in the search. Dared she speak of what she thought she had seen? Dared she speak with no evidence but her own word? Could she have been in error? First, she would look with the others.

Every palm, every flower, every inch of s.p.a.ce was carefully gone over.

No sign of the missing emeralds!

"Did anyone enter the conservatory after I left, Miss Thurston?"

inquired Mrs. Post coldly. She was worried by the loss of her jewels, which were of great value, as well as annoyed by the excitement she was causing.

"n.o.body came in," Bab said, "only Hugh."

"I am exceedingly sorry," the governor said at last, "but Mrs. Erwin will have to be notified. The jewels were either lost or stolen, and must be found. If the servants find the necklace a liberal reward will induce them to return it."

The older people left the conservatory.

Just as the younger ones turned to leave, Barbara, whose strange expression had not escaped the sharp eyes of Ruth, laid her hand on Hugh's arm.

"Ask Harry Townsend to stay here a minute with us, won't you please, Hugh?" said Barbara hoa.r.s.ely.

"Say, Townsend," Hugh called, "come back a moment. I want to speak to you. Or, rather, Miss Thurston does."

"Mr. Townsend," said Barbara, her face pale as death, "did you not see Mrs. Post's necklace when you took off her wrap in here?"

"No," said Harry quietly. "Did you?"

"Ask him, Hugh," said Barbara, desperately, "to show you what he has in his pockets!"

"Oh, say, Barbara!" Hugh answered. "I can't do that. It's a little too much."

But Ralph stepped forward. "We don't know what Miss Thurston means, but she most certainly doesn't mean to insult Mr. Townsend unnecessarily.

Why, then, should he mind turning out his pockets? Here Hugh," Ralph turned, "search me first. Then Mr. Townsend won't object to the selfsame process."

Hugh's face was crimson, but he looked through Ralph's pockets in a gingerly fashion.

When he finished Harry Townsend turned quietly to Barbara. "I don't know why you wish to insult me," he said to her, "but I am perfectly willing to have Mr. Post search me. You were the only person in the conservatory after the jewels were lost!"

Hugh started his search.

Barbara leaned sick and faint against her chair, expecting every moment to see Hugh draw the jewels forth. She kept her eyes averted while Harry turned his pockets wrong side out and finally opened his vest.

"Barbara," said Hugh, coldly, and Bab turned around. "We owe Mr.

Townsend an apology. He is certainly no thief!"

The jewels were nowhere to be found.

CHAPTER XIV-BARBARA'S SECRET

"Bab, Bab! What is the matter with you!" cried Mollie, for Barbara had thrown herself on the bed after their return from the ball, bursting into a torrent of tears.

"Oh, I don't know," sobbed Bab. "I must be wrong, or crazy, or something. Yet how can people doubt their own eyes?"

Mollie stopped spreading out her b.u.t.terfly dress, in which she had looked so pretty at the party, and flung her arms round her sister.