 While the succession and addition theorist are united in their opposition to any admixture, and while both believe that intension and remission occur in the subject and not in the qualitative form, they disagree about just how this intension and remission occurs. In the Tractatus alphabeticus, Wodeham shows himself to be numbered among the addition theorists. The key difference here is that the succession theorist believes that when a quality increases a new form of a given quality destroys and then replaces the old form. Wodeham and the addition theorist disagree. They hold that when qualitative change happens, a new form is indeed acquired, but it does not destroy the proceeding form. On the contrary, the new form takes in the preceding form as one of its parts. And here, the analogy of quantitative change is again helpful. When 9 increases to 10, the succession theorist argues that the old form of 9 is completely destroyed and replaced by an entirely new form, where no part of the old form of 9 contributes to the new form of 10. In opposition, the addition theorist argues that when a quality increases, this is analogous to the number 1 being added to 9, and through this addition, the new form of 10 is created. In this case, the old form of 9 has not been destroyed, but rather becomes a part of the new whole.