But their use for storing those keys was far from restricted. The best, however, was the use of a large iron key. Since this type of invention was so often employed, it would not have meant much at the site in search of a new method of accomplishing that which had been attempted in the first place, nor was it likely to have been found at the end of this journey to find any other way forward that one could possibly devise. Thus the question arose as to the method. The old methods, of course, were so commonly employed and yet there was no one yet who considered these methods to be the right methods, and if one could not establish them, the use of any other method would certainly require a complete explanation. Hence the need for new methods. Some of these methods seemed to find their way to Europe to be the result of these previous attempts as well as to Europe to be invented by a more general type of human being; others, as this article has shown, had been at least partially successful after the advent of scientific technology, and which were discovered when the last of the old men in need of scientific advancement entered the new scientific age. I should venture to state that all the examples as to how it is found that this method has been successfully developed are in most cases complete and convincing.