"Look!" she continued. "I am almost the same height. Just a little taller, perhaps, but you see her hair is nearly as fair as mine. Of course, you don't know what colour her eyes are--just fancy, Dad! they have been shut for nearly five thousand years, perhaps a little more--because I think they counted by dynasties then--and yet look at the features! Just imagine me dead!" "Just imagine yourself shutting the door on the other side, my dear Niti," said the Professor, who had risen from the chair, and was facing his daughter and the Mummy. "I don't want to banish you too unceremoniously, but I really have a lot of work to do to-night, and, as you might know, Bachelor of Science of London as you are, I have got to worry out as best I can, if I can do it at all, this problem that Hartley sent me about the Forty-seventh Proposition of the first book of Euclid." "Oh yes," she said, going to his side and putting her hand on to his shoulder as he stood facing the Mummy; "I have reason enough to remember that. And what does Professor Hartley say about it?" "He says, my dear Niti," said the Professor, in a voice which had something like a note of awe in it, "that when Pythagoras thought out that problem--which, of course, is not Euclid's at all--he almost saw across the horizon of the world that we live in." "But that," she interrupted, "would be something like looking across the edge of time into eternity, and that--well, of course, that is quite impossible, even to you, Dad, or Mr Hartley. What does he mean?" "He doesn't quite mean that, dear," replied the Professor, still staring straight at the motionless Mummy as though he half expected the lips which had not spoken for fifty centuries to answer the question that was shaping itself in his mind. "What Hartley means, dear, is this--that when Pythagoras thought out that proposition he had almost reached the border which divides the world of three dimensions from the world of four." "Which, as our dear old friend Euclid would say, is impossible; because you know, Dad, if that were possible, everything else would be. Come, now, Annie is bringing up your whisky and soda. Put away your problems and take your night-cap, and do get to bed in something like respectable time. Don't worry your dear old head about forty-seventh propositions and fourth dimensions and mummies and that sort of thing, even if this Mummy does happen to look a bit like me. Now, good night, and remember that the night-cap _is_ to be a night-cap, and when you've put it on you really must go to bed. You've been thinking a great deal too much this week. Good-night, Dad." "Good-night, Niti, dear. Don't trouble your head about my thinking. Sufficient unto the brain are the thoughts thereof. Sometimes they are more than sufficient. Good-night. Sleep well and don't dream, if you can help it."