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Full text: Japanese translation and original English

Holmes’s dawn explanation reaches its final link. He acted quickly after the concert, but Watson still wants to know why he expected the criminals to move that very night. Holmes answers without hesitation, completing the long chain of reasoning that turned the comic advertisement into a precisely timed ambush beneath the bank.

"And how could you tell that they would make their attempt to-night?" I asked.「それにしても、やつらが今夜決行すると、どうして分かったんだい?」と私は尋ねた。
"Well, when they closed their League offices that was a sign that they cared no longer about Mr. Jabez Wilson's presence—in other words, that they had completed their tunnel.「そうだね、組合の事務所を閉めたのは、もうジェイベズ・ウィルソン氏がいようがいまいが構わなくなったというしるしだ――言いかえれば、トンネルが完成したということさ。
But it was essential that they should use it soon, as it might be discovered, or the bullion might be removed.だが、見つかるおそれもあれば、金貨がよそへ移されるおそれもあるから、すぐに使うことがどうしても必要だった。
Saturday would suit them better than any other day, as it would give them two days for their escape.土曜日なら逃げるのに二日の余裕ができるから、ほかのどの曜日よりも都合がいい。
For all these reasons I expected them to come to-night."こうした理由がそろっていたから、今夜来ると見込んだのだ」
"You reasoned it out beautifully," I exclaimed in unfeigned admiration.「見事な推理だ」と私は心から感嘆して叫んだ。
"It is so long a chain, and yet every link rings true."「これほど長い鎖なのに、輪のひとつひとつがどれも確かなんだからね」