and appeared to be part of an estate of considerable size. The house itself was a good-sized dwelling, built in true Mexican style, with a great wall surrounding it, and the yard, or patio, as it is called, inside the walls. It was of dazzling whiteness, and, situated upon a little knoll that rose almost abruptly out of the otherwise level plain, made quite a pretentious appearance.
"Looks as though it might belong to people of quality," remarked Donald, as the boys approached it, after a sharp gallop of twenty minutes.
"Yes, or a fort of some kind, with that high wall all around it."
"The wall, as you call it, is part of the house," explained Donald. "However, it serves the purpose of a fortification. Father told me they got into the habit of building their houses in this way during the days when revolutions were of almost daily occurrence."
"A habit from which they haven't yet recovered," laughed Billie.
Riding up to th