Laid up in Lavender

"[...]came back he had a copy of the Times in his hand, and his face wore a look of perplexity. "I have read the riddle," he said, "and yet it is a riddle to me still. I never found time to read the report of my speech at the Club. It occurred to me to look at it now. It is full of errors; so full that it is clear the printer had not the corrected proof Atlay prepared. Therefore I conclude that Atlay's copy of the terms went to the Times instead of the speech. But how was the mistake...
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"[...]came back he had a copy of the Times in his hand, and his face wore a look of perplexity. "I have read the riddle," he said, "and yet it is a riddle to me still. I never found time to read the report of my speech at the Club. It occurred to me to look at it now. It is full of errors; so full that it is clear the printer had not the corrected proof Atlay prepared. Therefore I conclude that Atlay's copy of the terms went to the Times instead of the speech. But how was the mistake made?" "That is the question." It happened that the private secretary came into the room at this juncture. "Atlay," Mr. Stafford said at once, "I want you. Carry your mind back a week--to this day week. Are you sure that you sent the report of my speech at the Club to the Times?" "Am I sure?" the other replied confidently, nothing daunted by being so abruptly challenged. "I am quite sure I did, sir. I remember the[...]".