These early bows with screw-nuts quite dispel the generally accepted theory that this mechanical contrivance for regulating the tension and preserving the elasticity of the stick was the invention of the elder Tourte. The majority of writers on the history of the violin, and, incidentally, the bow, are content to take their data from that much quoted historian and scientist, Fetis. He appears to have made most of his more important statements on the authority of Vuillaume. How Vuillaume became so versed in the history of his craft does not appear. His talent in the way of producing "genuine" Cremonese and other masterpieces is well known, the most stupendous example being the Duiffoprugcar instruments with which he imposed on the violin world so successfully. May we infer that he had equal facility in the fabrication of historical "facts"? _De mortuis nil nisi bonum_, but at all cost our history must be made accurate. Better no facts at all than spurious ones. Having disposed of the screw attachment, the next important points in the development of the bow is the ferrule, which preserves the ribbon-like appearance of the hair, and the slide, which serves as an ornamental cover for the mortice in which the hair is fixed. These additions are commonly attributed to Francois Tourte, but in Fig. 31 I give a drawing of a typical nut by John Dodd, having both these improvements. [Illustration: FIG. 31.] Dodd and Tourte were contemporaries, Tourte's birth having taken place only five years before that of Dodd in 1752. When I come to speak more particularly of Tourte I shall show my reasons for thinking it unlikely that Dodd copied Tourte in this respect. The whole matter is shrouded in mystery. In other branches of science, art, etc., we find brilliant thinkers arriving simultaneously at identical results,[1] and I can quite believe that the idea of the ferrule and slide (obvious contrivances when one considers the requirements of a good bow) could have occurred to more than one of the workers then striving after perfection. [Footnote 1: As a noteworthy example, take the simultaneous discovery by deduction of the invisible planet Neptune, by Adams and Leverrier.]