 In Husserl’s view Spencer’s sentence is a tautology since positive and negative modes already form a pair of contradictory opposites. However, Husserl insists, the Principle of Non-Contradiction is no tautology (§26). Concerning psychologistic views of syllogistics, Husserl’s main target is the Dutch psychologist and philosopher Gerardus Heymans. On the one hand, Husserl points out that if the laws of syllogistics were laws of thought, then we would never commit fallacies. On the other hand, a psychological interpretation of syllogistics cannot explain why some inferences are valid and others invalid (§31).