No people, probably, are more familiar with the art of packing than the Mexicans. They understand the habits, disposition, and powers of the mule perfectly, and will get more work out of him than any other men I have ever seen. The mule and the donkey are to them as the camel to the Arab--their porters over deserts and mountains where no other means of transportation can be used to advantage. The Spanish Mexicans are, however, cruel masters, having no mercy upon their beasts, and it is no uncommon thing for them to load their mules with the enormous burden of three or four hundred pounds. These muleteers believe that, when the pack is firmly lashed, the animal supports his burden better and travels with greater ease, which seems quite probable, as the tension forms, as it were, an external sheath supporting and bracing the muscles. It also has a tendency to prevent the saddle from slipping and chafing the mule's back. With such huge _cargas_ as the Mexicans load upon their mules, it is impossible, by any precautions, to prevent their backs and withers from becoming horribly mangled, and it is common to see them working their animals day after day in this miserable plight. This heavy packing causes the scars that so often mark Mexican mules. The animal, in starting out from camp in the morning, groaning under the weight of his heavy burden, seems hardly able to move; but the pack soon settles, and so loosens the lashing that after a short time he moves along with more ease. Constant care and vigilance on the part of the muleteers are necessary to prevent the packs from working loose and falling off. The adjustment of a _carga_ upon a mule does not, however, detain the caravan, as the others move on while it is being righted. If the mules are suffered to halt, they are apt to lie down, and it is very difficult for them, with their loads, to rise; besides, they are likely to strain themselves in their efforts to do so. The Mexicans, in traveling with large caravans, usually make the day's march without nooning, as too much time would be consumed in unloading and packing up again. Packs, when taken off in camp, should be piled in a row upon the ground, and, if there be a prospect of rain, the saddles should be placed over them, and the whole covered with the saddle-blankets or canvas. The muleteers and herders should be mounted upon well-trained horses, and be careful to keep the animals of the caravan from wandering or scattering along the road. This can easily be done by having some of the men riding upon each side, and others in rear of the caravan. In herding mules it is customary among prairie travelers to have a bell-mare, to which the mules soon become so attached that they will follow her wherever she goes. By keeping her in charge of one of the herdsmen, the herds are easily controlled; and during a stampede, if the herdsman mounts her, and rushes ahead toward camp, they will generally follow.