Identify and explain Joseph Conrad's formal or informal writing style in this passage from The Heart of Darkness , citing specific examples from the text.

"Moreover, I respected the fellow. Yes; I respected his collars, his vast cuffs, his brushed hair. His appearance was certainly that of a hairdresser's dummy; but in the great demoralization of the land he kept up his appearance. That's backbone. His starched collars and got-up shirt-fronts were achievements of character. He had been out nearly three years; and, later on, I could not help asking him how he managed to sport such linen. He had just the faintest blush, and said modestly, 'I've been teaching one of the native women about the station. It was difficult. She had a distaste for the work.' This man had verily accomplished something. And he was devoted to his books, which were in apple-pie order."