The Prophet's biography in European scholarship

In the chapter "The Prophetic biography and the book The Life of Muhammad", Shakib Arslan offers a reading of the book by Emile Dermenghem, a French scholar, on the life of the Prophet. This is a description of the author's reading of another book, not a judgement on the Prophet's biography. ¹

The presentation covers the beginning of revelation, the Prophet's hadith and his narration of it, the question of the crucifixion of Christ and the comparison of the two beliefs about Jesus, and the collection of the Qur'an. ¹

He quotes a European historian's classification of the biographers according to the degree of trust in them. Arslan holds that the author of the book is fair, though he disagrees with him on details. ¹

A further source is needed: Dermenghem's book itself, and the identification of the European historian who made the classification.