She stared at him incredulously. "Even yet," she said, "I fail to see the ultimate adaptation of all this. I realize that you have discovered a hitherto unproved truth about the mechanism of thought. That is an achievement which will send your name ringing down the avenues of the future. But there seems to be something behind all you are telling me. You have more to say. What is the practical outcome of all this, this theoretical fact?"
"It is this," he answered. "I hold in my hands the power to know what this or that person, be it a king upon his throne, a girl on her wedding day, or a criminal in the dock, is thinking at any given moment."
She started from him with a little cry. "Oh no," she said, and her face had grown very white indeed. "Oh no, God would not allow it. It is a power only God has."
He laughed, and in his laugh she heard something that made her shrink back still further. It was a laugh such as Lucifer might have laughed, who defied a Power which he would not acknowledge to be greater than his.
"You will never do that," she said, "wonderful as you are."
"Marjorie," he answered, "I am a man with a brain that theorizes, but never ventures upon a statement that cannot be proved by fact. If I tell you this, if I hint broadly at the outcome of my life's work, I am doing so, believe me, because I have chapter and verse for all I say, because I can prove that it has passed from the dim realms of theory and of hope into the brilliant daylight of actual achievement!"
She stared at him. His words were too much for her mind to grasp immediately.
It was an intense moment.
But, as in real life intense moments generally are, it was broken by a curious interruption.
A voice came thickly from the arm-chair by the fire, where old Lady Poole had been reclining in placid sleep. It was the strange voice of one who sleeps, without expression, but perfectly distinct.
"I will not have it, cook—(indistinguishable murmur)—explained when I engaged you—will not have men in the kitchen!"
Sir William and Marjorie looked at each other for a moment with blank faces. Then, all overstrung as they were, the absurdity of the occurrence struck them at the same moment, and they began to laugh softly together.
It was a little pleasant and very human interlude in the middle of these high matters, and at that moment the great man felt that he was nearer to Marjorie than he had been before at any other moment of the afternoon. She no longer hung entranced upon his impassioned and wonderful words, she laughed with him quite quietly and simply.
Lady Poole snored deeply, and no longer vocalized the drama of her domestic dream.
Suddenly Marjorie turned back once more to Sir William.
"It's only mother dreaming about one of the servants we have had to send away," she said. "What a stupid interruption! Now, go on, go on!"
Her voice recalled him to his marvellous story.
"Tell me what is the actual achievement," she said.
"It is this. When you speak into a telephone the vibrations of your voice agitate a sensitive membrane, and by means of electricity the vibrations are conveyed to almost any distance. When Madame Melba sings into the gramophone, her voice agitates the membrane, which in its turn agitates a needle, which in its turn again makes certain marks upon a waxen disc."
"Yes, go on, go on!"
"When I put a certain instrument upon the head of a man or a woman, when I surround the field of emanation by a shield which captures the vibrations, they are conducted to a receiver more delicate and sensitive than anything which has ever been achieved by scientific process before. That receiver collects these vibrations and can transmit them, just in the manner of a telephone or telegraph wire, for almost any distance."
"And at the other end?" Marjorie asked.
"It has been a difficulty of ten long, anxious, unwearying years."
"And now?"
"Now that difficulty has been finally overcome."
"Therefore?"
"What a person thinks in London can be sent in vibrations along a wire to Paris."
"I see. I understand! But when there they can only be transmitted to another brain, of course. You mean that you have invented a more marvellous system of telegraphy than has ever been invented before. For instance, I could sit here in this room and communicate with you with absolute freedom in Paris. How wonderful that is! What a triumphant achievement! But—but, William, marvellous as it is, you do not substantiate what you said just now. The secrets of thought may be yours, but only when the sender wills it."
"Ah," he answered, with a deep note of meaning coming into his voice. "If I had only discovered what you say, I should have discovered much. But I have gone far, far away from this. I have done much, much more. And in that lies the supreme value of my work."
Once more they were standing together, strained with wonder, with amazement and triumph passing between them like the shuttle of a loom; once more she was caught up into high realms of excitement and dawning knowledge, the gates of which had never opened to her brain before.
"To come back to the phonograph," Sir William said. "The marks are made upon the waxen disc, and they are afterwards reproduced in sound, recorded upon metal plates to remain for ever as a definite reproduction of the human voice. Now, and here I come to the final point of all, I have discovered a means by which thought can be turned into actual vision, into an actual expression of itself for every one to read. What I mean is this. I have discovered the process, and I have invented the machine by which, as a person thinks, the thought can be conveyed to any distance along the wire, can be received at the other end by an instrument which splits it up into this or that vibration. And these vibrations actuate upon a machine by the spectroscope, by the bioscope, which show them upon a screen in the form of either pictures or of words as the thoughts of the thinker are at that moment sent out by the brain in words or pictures."
"Then what does this mean?"
"It means that once my apparatus, whether by consent of the subject or by force, is employed to collect the thought vibrations, then no secrets can be hidden. The human soul must reveal itself. Human personality is robbed of its only defence. There will be no need to try the criminal of the future. He must confess in spite of himself. The inviolability of thought is destroyed. The lonely citadel of self exists no longer. The pious hypocrite must give his secret to the world, and sins and sinners must confess to man what only God knew before."
Marjorie sat down in her chair and covered her face with her hands. Various emotions thronged and pulsed through her brain. The stupendous thing that this man had done filled her with awe for his powers, with terror almost, but with a great exultation also. She did not love him, she knew well that she had never loved him, but she realized her influence over him. She knew that this supreme intellect was hers to do with as she would. She knew that if he was indeed, as he said, master of the world, she was mistress of his mind, she was the mistress of him. The mysterious force of his love, greater than any other earthly force which he could capture or control, had made him, who could make the minds of others his slaves and instruments, the slave of her.
Yes! Love! That, after all, was the greatest force in the whole world. Here was a more conclusive proof than perhaps any woman had ever had before in the history of humanity.
Love! Even while the inmost secrets of nature were wrested from her by such a man as this, love was still his master, love was still the motive power of the world.
And as she thought that, she forgot for a moment all her fears and all her wonder, in a final realization of what all the poets had sung and all the scientists striven to destroy. Her blood thrilled and pulsed with the knowledge, but it did not thrill or pulse for the man whose revelations had confirmed her in it. The man whom she had promised to marry was the man who had confirmed her in the knowledge of the truth.