"I know that space is curved, that there is really no space or time, but only space-time, that electricity and gravitation and magnetism are all the same. But how is that going to pay my grocery bill--or yours?" "That's what Virginia wants to know." "Virginia Randall!" I was astonished. "Why, I thought--" "I know. We've been engaged a year. But she's called it off." Charlie looked into my eyes for a long minute, his lips still compressed. We were leaning on the freshly painted, streamline fuselage of the _Golden Gull_, as neat a little amphibian monoplane as ever made three hundred miles an hour. She stood on the glistening white sand of our private landing field on the eastern Florida coast. Below us the green Atlantic was running in white foam on the rocks. In the year that Charlie King and I had been out of the Institute of Technology, we had built the nucleus of a commercial airplane business. We had designed and built here in our own shops several very successful seaplanes and amphibians. Charlie's brilliant mathematical mind was of the greatest aid, except when he was too far lost in his abstruse speculations to descend to things commercial. Mathematics is painful enough to me when it is used in calculating the camber of an airplane wing. And pure mathematics, such as the theories of relativity and equivalence, I simply abhor. I was amazed. Virginia Randall was a girl trim and beautiful as our shining _Golden Gull_. I had thought them devotedly in love, and had been looking forward to the wedding. "But it isn't two weeks, since Virginia was out here! You took her up in our _Western Gull IV_!" * * * * * Nervously Charlie lit his pipe, drew quickly on it. His face, lean and drawn beneath the flying goggles pushed up on his forehead, sought mine anxiously. "I know. I drove her back to the station. That was when--when we quarreled." "But why? About Einstein? That's silly." "She wanted me to give it up here, and go in with her father in his Wall Street brokerage business. The old gent is willing to take me, and make a business man of me." "Why, I couldn't run the business without you, Charlie!" "We talked about that, Hammond. I don't really do much of the work. Just play around with the mathematics, and leave the models and blueprints to you." "Oh, Charlie, that's not quite--" "It's the truth, right enough," he said, bitterly. "You design aircraft, and I play with Einstein. And as you say, a fellow can't eat equations." "I'd hate to see you go." "And I'd hate to give up you, and our business, and the math. Really no need of it. My tastes are simple enough. And old 'Iron-clad' Randall has made all one family needs. Virginia's not exactly a pauper, herself. Two or three millions, I think." "And where did Virginia go?"