To add the final touch has the same sense, and is obviously taken from craftsmen who rough out a frist attempt or mock-up of the work and call this the first touch [prim manus], then shape it more exaclty, and finally polish it with the utmost care; and this they call the suprema or summa manus, the final touch. Ovid says, 'No patient reading will those works receive, / Unless it's known they lack the final touch.' Just afterwards he uses the 'file' for the same meaning: 'Taken untimely from the anvil, that; / My writings lack the last touch of the file.' Seneeca to Lucilius: 'Devotees of wine are particularly pleased by the last drink, the one which sinks them, which puts the final touch to their intoxication.' By the same metaphor we say, nothing is lacking but the 'extreme' touch. Instances of this are too frequent in literature for any other references to be necessary.