Footnote 19:

merino—a breed of sheep noted for fine wool
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Footnote 20:

O. Henry was an expert marksman with a pistol, a skill he picked up on the Texas ranches. Marksmanship plays an important role in another story in this book, "The Princess and the Puma."
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Footnote 21:

piedra—(Spanish) stone; a rocky place
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Footnote 22:

howdah—a seat, often with a canopy, for riding an elephant or camel
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Footnote 23:

The San Antonio & Aransas Pass Railroad, affectionately called the "SAAP" by two generations of Texans, was eventually incorporated into the International & Great Northern and later into the Missouri Pacific. As late as 1920 summer vacationers going to Central Texas resorts such as Comfort could take the S.A. & A.P. from San Antonio as far as Boerne (now on the northern edge of San Antonio) and then ride a stagecoach the rest of the way.
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