Leaving the consideration in general of the designs of Stradivari's early days, that is, for such a long life, we may look over some of the details. It is well known to connoisseurs that the handiwork of Nicolas Amati was during his best days of the utmost delicacy; in his later work we notice an approach to heaviness in some respects. The very beautiful subdivisions and subtleties of the curves in pattern and modelling began to disappear and the purfling became bolder. Young Stradivari, when working on some of his master's violins, seems to have been allowed to do some of this, probably with the material given out by old Nicolas. The work of the young man may be known by its greater decision, such as would be reasonably expected; but after leaving the Amati household the natural bent towards exceeding refinement soon asserted itself. The purfling, particularly after some years, is narrower, and inserted with a precision and ease in its course impossible to excel, even if approachable. The mitring at the corners ends in a bent point in the manner introduced by Hieronymus Amati and not, as has been stated, by Stradivari; the latter carried out the ideas of Nicolas in making it very sharp and this mannerism he continued throughout the whole of his career. Stradivari from the first made his sound holes more perpendicular than those of his master; after leaving him, they also became more slender and the upper and lower wings wider and closer to the opposing curve. The precision and sharpness of the cutting of these parts has become the standard of excellence to which hundreds of Stradivari's imitators of different countries and times have striven to attain. It is, perhaps, in these parts of the different instruments--for Stradivari soon got to work on all the four sizes, besides other kinds not played with the bow--that his fine nervous system manifests itself, the sureness of his knife when passing along from one point to another leaving an edge upright and clean as cut glass, yet with a free grace of line never excelled by any master of the renaissance period. Of the parts the young assistant of Nicolas Amati was allowed to put his individuality to, conspicuously stands the scroll. The one typical of Nicolas's later days, although free and elegant, yet had a somewhat heavier touch about it, possibly the master was gradually losing his muscular power, more necessary to exert in this matter of detail than any other. Stradivari began his own type by bringing the first turn from the axis or "eye" a little higher up than that of his master; the axis itself is a trifle larger and flatter, the edges of the turns are squared off with a machine-like exactness that does not interfere with the ease and flow of line. The peg box is strong and ample, after a few years it became massive, more so occasionally than is to be met with at any other time, the grooves down the back are not so deep, the termination or shell likewise and a little wider.