The constant changes in the law made by current legislation in the different states really only added to the confusion, and though imperial laws on these points with which the central government was qualified to deal superseded the state laws, it is obvious that to pass occasional acts on isolated points would have been only to introduce a further element of complication. It was therefore convenient, so far as was possible, to allow the existing system to continue until a full and complete code dealing with the whole of one department of law could be agreed upon, and thus a uniform system (superseding all older legislation) be adopted. Legislation, therefore, has generally taken the form of a series of elaborate codes, each of which aims at scientific completeness, and further alterations have been made by amendments in the original code. The whole work has been similar in character to the codification of French law under Napoleon; in most matters the variety of the older system has ceased, and the law of the empire is now comprised in a limited number of codes. A beginning had been made before the foundation of the empire; as early as 1861 a common code for trade, commerce and banking had been agreed upon by the states included in the Germanic Confederation. It was adopted by the new confederation of 1869. In 1897 it was replaced by a new code. In 1869 the criminal law had been codified for the North German Confederation, and in 1870 there was passed the _Gewerbeordnung_, an elaborate code for the regulation of manufactures and the relations of masters to workmen. These were included in the law of the empire, and the work was vigorously continued.