During the 19^th century in France, philosophy became an academic discipline with a strong identity. One side effect of that institutionalisation of philosophy was that the academic career of the philosopher in training (through high school, École normale supérieure, University, agrégation, Ph.D.) did not involve a great deal of mathematical study. This raises the question of the possible interaction between mathematics and philosophy. However, it is now very common to mention the development of the reflection on non-Euclidean geometry at that time. One may ask how that reflection took root in France from a material and intellectual point of view. Several studies show that the academic journals of philosophy were -- at the end of the 19th century -- fundamental places for philosophy and sciences to meet. The difficulty is then to describe how they met. Thousands of papers were published by hundreds of authors during the last quarter of the 19th century. Among them, which ones are aimed at the philosophy of mathematics? Who wrote them? What are their subjects? In order to give some answers, this paper uses a case study providing an illustrative example. That case study focuses on Paul Tannery’s writings in the Revue Philosophique de la France et de l’Étranger. Our point is to describe some aspects of the bridge between philosophy and mathematics that Tannery contributed to construct around strategic references to Kant.