Chapter 1: Reflections on Bourbaki's Notion of "Structure" and Categories.- Chapter 2: Bourbaki and Foundations.- Chapter 3: Forms of Structuralism: Bourbaki and the Philosophers.- Chapter 4: Ladders of sets and isomorphisms The shortcomings of Bourbaki's notion of "structure".- Chapter 5: The difficulty of neutrality A graph-theoretical solution.- Chapter 6: The wrapped dimension of Bourbaki's structures mères.