And with a swish of her full skirts and a toss of her huge hat and feathers, the lively flirt of sixty tripped off with all the agility of sixteen, leaving Courtney to follow her or remain where he was, just as he chose. He hesitated, and during that undecided pause was joined by Dr. Maxwell Dean.
"A very brilliant and interesting evening!" said that individual, smiling complacently. "I don't remember any time when I have enjoyed myself so thoroughly."
"Really! I shouldn't have thought you a man to care for fancy- dress balls," said Courtney.
"Shouldn't you? Ha! Well, some fancy-dress balls I might not care for, but this one has been highly productive of entertainment in every way, and several incidents connected with it have opened up to me a new vista of research, the possibilities of which are--er- -very interesting and remarkable."
"Indeed!" murmured Courtney indifferently, his eyes fixed on the slim, supple figure of the Princess Ziska as she slowly moved amid her circle of admirers out of the ball-room, her golden skirts gleaming sun-like against the polished floor, and the jewels about her flashing in vivid points of light from the hem of her robe to the snake in her hair.
"Yes," continued the Doctor, smiling and rubbing his hands, "I think I have got the clue to a very interesting problem. But I see you are absorbed--and no wonder! A charming woman, the Princess Ziska--charming! Do you believe in ghosts?"
This question was put with such unexpected abruptness that Courtney was quite taken aback.
"Ghosts?" he echoed. "No, I cannot say I do. I have never seen one, and I have never heard of one that did not turn out a bogus."
"Oh! I don't mean the usual sort of ghost," said the Doctor, drawing his shelving brows together in a meditative knot of criss- cross lines over his small, speculative eyes. "The ghost that is common to Scotch castles and English manor-houses, and that appears in an orthodox night-gown, sighs, screams, rattles chains and bangs doors ad libitum. No, no! That kind of ghost is composed of indigestion, aided by rats and a gust of wind. No; when I say ghosts, I mean ghosts--ghosts that do not need the midnight hour to evolve themselves into being, and that by no means vanish at cock-crow. My ghosts are those that move about among us in social intercourse for days, months--sometimes years--according to their several missions; ghosts that talk to us, imitate our customs and ways, shake hands with us, laugh and dance with us, and altogether comport themselves like human beings. Those are my kind of ghosts- -'scientific' ghosts. There are hundreds, aye, perhaps thousands of them in the world at this very moment."