“What of this ‘Cooee!’ then?”

“Well, obviously it could not have been meant for the son. The son, as far as he knew, was in Bristol. It was mere chance that he was within earshot. The ‘Cooee!’ was meant to attract the attention of whoever it was that he had the appointment with. But ‘Cooee’ is a distinctly Australian cry, and one which is used between Australians. There is a strong presumption that the person whom McCarthy expected to meet him at Boscombe Pool was someone who had been in Australia.”

“What of the rat, then?”

Sherlock Holmes took a folded paper from his pocket and flattened it out on the table. “This is a map of the Colony of Victoria,” he said. “I wired to Bristol for it last night.” He put his hand over part of the map. “What do you read?”

“ARAT,” I read.

“And now?” He raised his hand.

“BALLARAT. “

“Quite so. That was the word the man uttered, and of which his son only caught the last two syllables. He was trying to utter the name of his murderer. So and so, of Ballarat.”

“It is wonderful!” I exclaimed.

“It is obvious. And now, you see, I had narrowed the field down considerably. The possession possession of a gray garment was a third point which, granting the son’s statement to be correct, was a certainty. We have come now out of mere vagueness to the definite conception of an Australian from Ballarat with a gray cloak.”

“Certainly. “

“And one who was at home in the district, for the pool can only be approached by the farm or by the estate, where strangers could hardly wander.”

“Quite so.”

“Then comes our expedition of to-day. By an examination of the ground I gained the trifling details which I gave to that imbecile Lestrade, as to the personality of the criminal.”

“But how did you gain them?”

“You know my method. It is founded upon the observation of trifles.”

“His height I know that you might roughly judge from the length of his stride. His boots, too, might be told from their traces.”

“Yes, they were peculiar boots.”

“But his lameness?”

“The impression of his right foot was always less distinct than his left. He put less weight upon it. Why? Because he limped — he was lame.”

“But his left-handedness.”

“You were yourself struck by the nature of the injury as recorded by the surgeon at-the inquest. The blow was struck from immediately behind, and yet was upon the left side. Now, how can that be unless it were by a left-handed man? He had stood behind that tree during the interview between the father and son. He had even smoked there. I found the ash of a cigar, which my special knowledge of tobacco ashes enables me to pronounce as an Indian cigar. I have, as you know, devoted some attention to this, and written a little monograph on the ashes of 140 different varieties of pipe, cigar, and cigarette tobacco. Having found the ash, I then looked round and discovered the stump among the moss where he had tossed it. It was an Indian cigar, of the variety which are rolled in Rotterdam.”

“Well, then, au revoir, till luncheon,” cried Francis.

The train was fairly full in the third and second classes. However, Aaron got his seat, and the porter brought on his bags, after disposing of the young men’s luggage. Aaron gave the tip uneasily. He always hated tipping—it seemed humiliating both ways. And the airy aplomb of the two young cavaliers, as they settled down among the red plush and the obsequiousness, and said “Well, then, au revoir till luncheon,” was peculiarly unsettling: though they did not intend it so.

“The porter thinks I’m their servant—their valet,” said Aaron to himself, and a curious half–amused, half–contemptuous look flickered on his face. It annoyed him. The falsity occasioned by the difference in the price of the tickets was really humiliating. Aaron had lived long enough to know that as far as manhood and intellect went—nay, even education—he was not the inferior of the two young “gentlemen.” He knew quite well that, as far as intrinsic nature went, they did not imagine him an inferior: rather the contrary. They had rather an exaggerated respect for him and his life–power, and even his origin. And yet—they had the inestimable cash advantage—and they were going to keep it. They knew it was nothing more than an artificial cash superiority. But they gripped it all the more intensely. They were the upper middle classes. They were Eton and Oxford. And they were going to hang on to their privileges. In these days, it is a fool who abdicates before he’s forced to. And therefore:

“Well, then—au revoir till luncheon.”

They were being so awfully nice. And inwardly they were not condescending. But socially, they just had to be. The world is made like that. It wasn’t their own private fault. It was no fault at all. It was just the mode in which they were educated, the style of their living. And as we know, le style, c’est l’homme.

Angus came of very wealthy iron people near Merthyr. Already he had a very fair income of his own. As soon as the law–business concerning his father’s and his grandfather’s will was settled, he would be well off. And he knew it, and valued himself accordingly. Francis was the son of a highly–esteemed barrister and politician of Sydney, and in his day would inherit his father’s lately–won baronetcy. But Francis had not very much money: and was much more class–flexible than Angus. Angus had been born in a house with a park, and of awful, hard–willed, money–bound people. Francis came of a much more adventurous, loose, excitable family, he had the colonial newness and adaptability. He knew, for his own part, that class superiority was just a trick, nowadays. Still, it was a trick that paid. And a trick he was going to play as long as it did pay.

While Aaron sat, a little pale at the gills, immobile, ruminating these matters, a not very pleasant look about his nose–end, he heard a voice: