The passage I quoted in my Synthese article points to the fact that, at
some point, Bourbaki faced the need to discuss a possible combination of
categories with Bourbaki's theory of structures. The fact that nothing
came out of that proposed Chap V of the book on Set Theory, is very
indicative in itself. I discuss this a bit in that article and more in
detail in my book" _Modern Algebra and the Rise of Mathematical Structures_.
Concerning Mandelbrojt, there is not much I can add to Liliane's remark.
Perhaps only this: in an article by Benoit Mandelbrot (whose exact
reference I cannot recall at the moment, but appears in the bibliography
in my book) he speaks of his uncle and how his own work evolved partly as
a backlash against Bourbaki.
I hope this clarifies something to someone.
Leo Corry