The masterly manœuvre executed by the town magistrates is revealed in the self-denying ordinances passed by the later guilds. Crafts “petition,” as we are gravely told, to have masters and ordinances, and these being granted the new rules turn out to be simply regulations to supply wares to the people of a fixed quality and price.[288] We can scarcely believe that the farriers should of their own free will have devised the rule that if any one of them, through negligence or any excess of pride which hindered his asking advice of the craft, failed in curing a horse of sickness, “then he shall be accused thereof before the Mayor and Aldermen and be punished at their discretion, in the way of making restitution for such horse to the person to whom the same belongs.”[289] Nor is it likely that masons and carpenters should have volunteered to take oath before Mayor and Aldermen that they would do their duty in their trade;[290] or that the masons should themselves propose that if a mason failed to fulfil his contract certain men of the trade who acted as his securities should be bound to finish his task.[291] Even the universal rule against night work was never among the London guilds (save in the single instance of the hat-makers)[292] made in the interest of the working-man; but on the contrary was dictated by the sagacious observation of the buyers that “sight is not so profitable by night, or so certain, as by day—_to the profit, that is, of the community_;”[293] and if spurriers “who compass how to practise deception in their work desire to work by night rather than by day”[294] the reason given for interfering with them was that they wandered about all day idle, and “then when they have become drunk and frantic they take to their work to the annoyance of the sick and all their neighbourhood ... and then they blow up their fires so vigorously that their forges begin all at once to blaze ... and all the neighbours are much in dread of the sparks which so vigorously issue forth in all directions from the mouths of the chimneys in their forges.”[295] Sunday closing itself was ordered as a matter of public convenience, because apprentices “could not be trusted to carry on work in the absence of their masters at church.”[296]