for the paths from village to village wind up and down over the dunes. At Sinoquipe the Spaniards would come upon the series of deep ravines which extend uninterruptedly to Arispe, and thence with slight intermissions to near Bacuachi, and often force the traveller to take to the bed of the river. In the whole distance of one hundred and forty miles between Babiácora and the source of the Sonora the traveller leaves the river bank only once for a short time, while he crosses the narrow stream two hundred and fifty times. It is one of the most charming and at the same time least difficult routes which the North American continent offers to a horseman. A steadily mild climate enhances the traveller's pleasure.
The "Cajon," more than twenty miles in length, through which one passes in going from Sinoquipe to Arispe, is rich in the magnificent development of the most diversified rock-forms. When the "Cabezon de San Benito," a massive, bell-shaped peak, has sunk behind the ever-increasing heights north of Sinoquipe, and these gather thickly around the river's course, there also disappears in the east the rudely notched mountain of the nueve Minas, and the inviting cove of Tetuachi reposes on the right bank, surrounded by mighty mountains. Narrow tongues of rock jut forward into the peaceful valley, fall perpendicularly to the ground, and imitate artificial masonry in their resemblance to squared stones piled up in regular symmetry. The rocks that overhang them, rising thousands of feet, are clothed with the peculiar vegetation of the country, which lends a tint of green to even the highest crests.
