How is the chief accountant referred to "this miracle"

From the text:

When near the buildings I met a white man, in such an unexpected elegance of get-up that in the first moment I took him for a sort of vision. I saw a high starched collar, white cuffs, a light alpaca jacket, snowy trousers, a clear necktie, and varnished boots. No hat. Hair parted, brushed, oiled, under a green-lined parasol held in a big white hand. He was amazing, and had a penholder behind his ear.

"I shook hands with this miracle, and I learned he was the Company's chief accountant, and that all the bookkeeping was done at this station. He had come out for a moment, he said, 'to get a breath of fresh air.' The expression sounded wonderfully odd, with its suggestion of sedentary desk-life. I wouldn't have mentioned the fellow to you at all, only it was from his lips that I first heard the name of the man who is so indissolubly connected with the memories of that time. 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.

"Everything else in the station was in a muddle,—heads, things, buildings. Strings of dusty niggers with splay feet arrived and departed; a stream of manufactured goods, rubbishy cottons, beads, and brass-wire sent into the depths of darkness, and in return came a precious trickle of ivory.