The burro is a native of Spain, and he came to America at the time of the Spanish conquest. He carried the accoutrements of Cortez through Mexico and into the Montezumian capital. He was with De Soto when he journeyed into the heart of the American continent. De Balboa was indebted to him for the opportunity to discover the greatest of oceans. The padres who planted the chain of missions through Mexico, and who three hundred and fifty years ago reared the walls of the mission of San Xavier del Bac, in Arizona, had the assistance of the burro. The Franciscan fathers, who more than a century ago dotted the coast of California with another chain of missions, depended upon the burro for aid, and he did not disappoint them. And so for more than three centuries he has been in the procession of progress and has marched at its head. [Illustration: SHIPS OF THE DESERT From photograph by C. C. Pierce & Co.] The fortunes of the Spaniard have fluctuated, but the burro has known no rise nor fall in his prospects. He came as a beast of burden, and as such he has remained. It is all one with him--Spain or America. If he has a little to eat, a few hours for slumber, and is not too heavily burdened, he will patiently and contentedly perform his work and offer no complaint. He clambers up the mountain trail where the horse could find no footing, carrying upon his back twice his own weight, and he picks his way along the brow of the mountain or the edge of mighty precipices as unconcernedly as though he were treading the pavement of a boulevard or the soft turf of green meadows. If his owner places too heavy a load upon him he makes no complaint. Not he! He simply lies down till the burden is made lighter. There is no arguing the question with him. He is indifferent alike to blows and pleadings. Not an inch will he stir till matters are adjusted. He knows his capacity, and his load must conform to it. Few mines have been discovered in the mountainous or desert regions of the West without the assistance of the burro. The steel tracks of the locomotive which wind in and out of the cañons and passes and over the mountains were led thither by the burro. The explorer has thrown the burden of his efforts upon him, and the prospector deems him indispensable. He is the veritable "ship" of the western desert, and many a man owes his life to his burro. He will live longer without water and scent it farther than any known animal save the camel.