The result of his application was twofold. In the first place he discovered that he was very ignorant and that there existed a huge illimitable field of knowledge worth entering on seriously. His early training having been conducted (thanks to his mother) "in the fear of the Lord," he regarded things that are spiritual, and have God and man's duty to Him for their object, as part--the chief part--of that great field of knowledge; not as a separate field which may or may not be entered on according to taste. In the second place, he began to discover that his kind-hearted employer was a monomaniac. In other words, that, although sane enough in all other matters, he was absolutely mad in regard to mechanical discoveries and inventions, and that most of the latter were absolutely nonsensical. This second discovery induced him to prosecute his studies with all the more energy, in order that he might be prepared for the battle of life, in case his existing connection with Mr Tippet should be dissolved. His studies naturally took an engineering turn, and, being what is termed a thorough-going fellow, he did not rest until he had dived into mathematics so deep that we do not pretend to follow him, even in the way of description. Architecture, surveying, shipbuilding, and cognate subjects, claimed and obtained his earnest attention; and year after year, on winter nights, did he sit at the side of the fire in the little house at Notting Hill, adding to his stores of knowledge on these subjects; while his meek old mother sat darning socks or patching male attire on the other side of the fire with full as much perseverance and assiduity. One consequence of this was that Willie Willders, having begun as a Jack-of-all trades, pushed on until he became a philosopher-of-all-trades, and of many sciences too, so that it would have been difficult to find his match between Charing Cross and Primrose Hill. And Willie was not changeable. True to his first love, he clung with all the ardour of youth to fire, fire-engines, and the fire-brigade. He would have become a member of the latter if he could, but that was in the circumstances impossible. He studied the subject, however, and knew its history and its working details from first to last. He did his best to invent new engines and improve on old ones; but in such matters he usually found that his inventions had been invented, and his improvements made and improved upon, long before. Such checks, however, did not abate his ardour one jot. He persevered in his varied courses until he worked himself into a species of business which could exist only in London, which it would be difficult to describe, and which its practitioner styled "poly-artism" with as much boldness as if the word were in Johnson's Dictionary! Standing on the hearth, as we have said, Willie related to his friend all he knew in regard to the Cattley family, and wound up with an anxious demand what was to be done for them.