In the celebrated Livre des tiers of Etienne Boileau, we find it prescribed that a journeyman on being admitted among the masters had to swear to love his brethren with brotherly love, to support them in their respective trades, not wilfully to betray the secrets of the trade, and besides, in the interests of all, not to recommend his own wares by calling the attention of the buyer to defects in the articles made by others.