Ere we could express our admiration, however, we were startled by a magical transformation of the scene. The sky suddenly became blue, the stars vanished from sight, the sun changed to a golden lustre, and the broad day was all around us. "Whatever has happened?" exclaimed Miss Carmichael between alarm and wonder. "We have entered the atmosphere of Venus," responded Gazen with alacrity. "I wonder if it is breathable?" So saying he opened one of the scuttles, and a whiff of fresh air blew into the car. Thrusting his nose out, he sniffed cautiously for a while and then drew several long breaths. "It seems all right as regards quality," he remarked, "but there's too little body in it. We must wait until we get nearer the ground before we can go outside the car." The pressure of the atmosphere as taken by an aneroid barometer confirmed his observation, but as we were ignorant of its average density it could not give us any certain indication of our height. Far beneath us an ideal world of clouds hid the surface from our view. We seemed to be floating above a range of snowy Alps, their dusky valleys filled with glaciers, and their sovereign peaks glittering in the sun like diamonds. As we descended in a long slant, their dazzling summits rose to meet us, and the infinite play of light and shade became more and more beautiful. The gliding car threw a distinct shadow which travelled along the white screen, and equally to our surprise and delight became fringed with coloured circles resembling rainbows. "It is a good omen!" cried Miss Carmichael. "Humph!" responded the professor, shaking his head but smiling good-humouredly; "that is a mere superstition I'm afraid. It is simply an optical effect, a variety of the phenomenon called 'anthelia,' like Ulloa's Circle and the famous 'Spectre of the Brocken.'" "Explain it how you will," rejoined Miss Carmichael, "to me it is an emblem of hope. It cheers my heart." "I am very glad to hear it, and I should be very sorry to crush your hopes," said Gazen pleasantly. "We can sometimes derive moral encouragement and profit from external phenomena. A rainbow in the midst of a storm is a cheering sight. I daresay there is a reasonable basis, too, for certain superstitions. St. Elmo's Fire may, for instance, from natural causes, be a sign of good weather, only there is nothing supernatural about it." "I am not in the secrets of the supernatural," replied Miss Carmichael, "but I believe that if we do not look for the supernatural, if we shut our eyes to it, we are not likely to see it." "Science has proved that so many things formerly thought to be supernatural are quite natural," observed the astronomer a little more humbly. "Perhaps the natural and the supernatural are one," said Miss Carmichael. "Does a thing cease to be supernatural because we know something about it?"