In Peters and Pomeroy's fourth edition of Commercial Law, a number of cases are cited where there is a difference between the laws and rulings of the various states. There are only three cases in which the difference is given. The procedure was to find all of the cases in which there is any doubt as to the Texas law, and to quote the law or ruling as given by Peters and Pomeroy, and then to give the law or ruling of the State of Texas.