A continuation of Vol. 1. The book always feels as if it was written for A. Messiah, not so much the French students. I would not recommend these to volumes for learning Quantum Theory or Mechanics. The book rambles and he will drop items in with little or no explanation. His notation is bad, and numbering is in Roman Numerals, which is balky and unnecessary.
Again this book was written in French, for the late 1950's French student and then translated to English. Maybe something was missing in the translation.
I'm done with the books and will never look at them again. There are much better books.
But then why did I read them. They have been sitting on my bookshelf for years and decided to just turn them in to summer reading (I'm a nerd.).