H. H. WALES. LADO SUR DE LA ALAMEDA. CALLE DE LA ARTILLERIA No. 6, Hotel Internacional S.L.P. San Luis Potosi, de 190 Looking back to Tamaaspo from the station Verastegui high up on the Cretaceous walls what a sea of hills and mountains are to the east! A grand sight and a wonder how the railroad has picked its way through these labyrinth hills and craggy valleys. But by following the windings of the little mountain stream rising through the Tamaaspo canyon and again over the Orico falls the puzzle is solved. Turning around the point just a little of grade and beyond Verastegui one enters the Tamaaspo canyon and remains in it away to Las Canas, the canoe-shaped (rather saucer shaped) valley, a distance of 12 kilometers. From Las Canas to Tamaaspo station on the lower level it is 27 kilometers and throughout this entire distance the grade is about 4%, a difference in elevation of [illegible] feet. The Tamaaspo canyon is not a single cleft but a winding cleft with hills and mountains in its left by the rapidly cutting stream. One cone like a volcanic cone is left standing in it and formed was an island around all sides of which the water rushed by. I have a picture of it. Throughout this canyon the Cretaceous limestones stand vertically and at one tunnel entrance there is a flat sided wall the edges of the limestone serrated giving the idea of a Devils Back Bone or slide. One of my pictures taken further up the canyon may show this but if not then of another wall with a tunnel entrance. The smooth of the mountain side had like made of rock to level off the track.