"Yes--if you come alone!" These words sounded so close to her ear that she felt sure the speaker must be standing beside her. "I will come!" she said, impulsively--"Somehow--some way!--no matter how difficult or dangerous! I will come!" As she spoke she was conscious of a curious vibration round her, as though some other thing than the ceaseless, silent throbbing of the air-ship's mechanism had disturbed the atmosphere. "Wait!" said the Voice--"You say this without thought. You do not realise the meaning of your words. For--if you come, you must stay!" A thrill ran through her blood. "I must stay!" she echoed--"Why?" "Because you have learned the Life-Secret,"--answered the Voice--"And, as you have learned it, so must you live. I will tell you more if you care to hear--" An inrush of energy came to her as she listened--she felt that the unseen speaker acknowledged the power which she herself knew she possessed. "With all my soul I care to hear!" she said--"But where do you speak from? And who are you that speak?" "I speak from the central Watch-Tower,"--the Voice replied--"The City is guarded from that point--and from there we can send messages all over the world in every known language. Sometimes they are understood--more often they are ignored,--but we, who have lived since before the coming of Christ, have no concern with such as do not or will not hear. Our business is to wait and watch while the ages go by,--wait and watch till we are called forth to the new world. Sometimes our messages cross the 'wireless' Marconi system--and some confusion happens--but generally the 'Sound Ray' carries straight to its mark. You must well understand all that is implied when you say you will come to us,--it means that you leave the human race as you have known it and unite yourself with another human race as yet unknown to the world!" Here was an overwhelming mystery--but, nothing daunted, Morgana pursued her enquiry. "You can talk to me on the Sound Ray"--she said--"And I understand its possibility. You should equally be able to project your own portrait--a true similitude of yourself--on a Light Ray. Let me see you!" "You are something of a wilful spirit!" answered the Voice--"But you know many secrets of our science and their results. So--as you wish it--"