THE first chapter describing an expedition is liable to be prosaic to the point of dullness. It is full of promises that are expected to be realized, while as yet nothing has been done. Not one-tenth of these may formulate, and yet the expedition may be a success in unexpected results; for in no undertaking is there so much uncertainty as in travel through little known countries. Then, again, the writer is likely to consider himself called upon to give a lengthy description of the party in the preliminary letter, and, as I have often seen, even descend to an enumeration of the qualities of the cook or the color of the mules. The next night the cook may desert and the mules may run away, so that others must be procured, and therefore they are of no more interest to the reader than any other of the millions of cooks or mules that would make any writer wealthy if he could find a publisher who would print his description of them.