Franklin's remark may have itself undergone enlargement before it appeared in print, but though it may have been exaggerated, there seems no ground for rejecting it altogether. Smith became acquainted with Franklin in Edinburgh in 1759, and could not fail to see much of him in London, because some of the most intimate of his own London friends, Sir John Pringle and Strahan, for example, were also among the most intimate friends of Franklin. Then a considerable proportion of the additions, which we know from the text of the _Wealth of Nations_ itself to have been made to the work during this London period, bear on colonial or American experience.[233] And as Smith always obtained a great deal of his information from the conversation of competent men, no one would be more likely than Franklin to be laid under contribution or to be able to contribute something worth learning on such questions. The biographer of Franklin states that his papers which belong to this particular period "contain sets of problems and queries as though jotted down at some meeting of philosophers for particular consideration at home," and then he adds: "A glance at the index of the _Wealth of Nations_ will suffice to show that its author possessed just that kind of knowledge of the American Colonies which Franklin was of all men the best fitted to impart. The allusions to the Colonies may be counted by hundreds; illustrations from their condition and growth occur in nearly every chapter. We may go further and say that the American Colonies constitute the experimental evidence of the essential truth of the book, without which many of its leading positions had been little more than theory."[234] It ought of course to be borne in mind that Smith had been in the constant habit of hearing much about the American Colonies and their affairs during his thirteen years in Glasgow from the intelligent merchants and returned planters of that city.