THEY never did discover whose fault it was. Fannia pointed out that if Donnaught had had the brains of an ox, as well as the build, he would have remembered to check the tanks. Donnaught, although twice as big as him, wasn't quite as fast with an insult. He intimated, after a little thought, that Fannia's nose might have obstructed his reading of the fuel gauge. This still left them twenty light-years from Thetis, with a cupful of transformer fuel in the emergency tank. "All right," Fannia said presently. "What's done is done. We can squeeze about three light-years out.