I took the extract from Hugh Macnaghten's "Fifty Years of Eton" (1924) in which he devoted a chapter to Michael. I'm afraid Macnaghten gives no more than the passage I quoted, other than introducing it by saying that "It was in this Half that writing "What makes a Gentleman" he [Michael] seemed to me to show a kinship in spirit to his guardian," i.e. Barrie.