On the second morning after their exciting experiences in the mines they rode away, bound for the nearest railroad station, all anticipation at the prospect of a sojourn on the great Nevada desert, of which they had heard so much. How they lost themselves there, their efforts to extricate themselves from the desert maze, attended by a remarkable series of strange happenings, will be told in a following volume entitled, "THE PONY RIDER BOYS IN THE ALKALI."