Thus, to the end of the 1901 experiments, Wilbur Wright provided a fairly full account of what was accomplished; the record shows an amount of patient and painstaking work almost beyond belief--it was no question of making a plane and launching it, but a business of trial and error, investigation and tabulation of detail, and the rejection time after time of previously accepted theories, till the brothers must have felt that the solid earth was no longer secure, at times. Though it was Wilbur who set down this and other records of the work done, yet the actual work was so much Orville’s as his brother’s that no analysis could separate any set of experiments and say that Orville did this and Wilbur did that--the two were inseparable. On this point Griffith Brewer remarked that ‘in the arguments, if one brother took one view, the other brother took the opposite view as a matter of course, and the subject was thrashed to pieces until a mutually acceptable result remained. I have often been asked since these pioneer days, “Tell me, Brewer, who was really the originator of those two?” In reply, I used first to say, “I think it was mostly Wilbur,” and later, when I came to know Orville better, I said, “The thing could not have been done without Orville.” Now, when asked, I find I have to say, “I don’t know,” and I feel the more I think of it that it was only the wonderful combination of these two brothers, who devoted their lives together for this common object, that made the discovery of the art of flying possible.’ Beyond the 1901 experiments in gliding, the record grows more scrappy, less detailed. It appears that once power-driven flight had been achieved, the brothers were not so willing to talk as before; considering the amount of work that they put in, there could have been little time for verbal description of that work--as already remarked, their tables still stand for the designer and experimenter. The end of the 1901 experiments left both brothers somewhat discouraged, though they had accomplished more than any others. ‘Having set out with absolute faith in the existing scientific data, we were driven to doubt one thing after another, till finally, after two years of experiment, we cast it all aside, and decided to rely entirely on our own investigations. Truth and error were everywhere so intimately mixed as to be indistinguishable.... We had taken up aeronautics as a sport. We reluctantly entered upon the scientific side of it.’