Andrew Carnegie：Autobiography of Andrew Carnegie, Excerpt 16

I had only one fear, and that was that I could not learn quickly enough the addresses of the various business houses to which messages had to be delivered. I therefore began to note the signs of these houses up one side of the street and down the other. At night I exercised my memory by naming in succession the various firms. Before long I could shut my eyes and, beginning at the foot of a business street, call off the names of the firms in proper order along one side to the top of the street, then crossing on the other side go down in regular order to the foot again.

Source： https://www.gutenberg.org/ebooks/17976
Locator：Chapter III, excerpt 16 · Verified：2026-10-19 · Verification：Short excerpt

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