[Our author evidently, in the above remarks, confounds the Louisiana marmot, Arctomys Ludovicianus or Prairie dog, with the Canis Latrans of Say, as he certainly would not make us believe that such harmless animals as the marmot should associate themselves in packs to hunt the deer or other quadrupeds; neither would he tell us that so different an animal as the Canis Latrans could burrow in the ground and retreat to their holes when surprised by the hunter. The Louisiana Marmot, improperly called Prairie dog, is about sixteen inches long, and lives in extended villages or excavations surmounted by mounds. These communities often comprise several thousand inhabitants, whose sole food consists in the scanty herbage surrounding the settlement, as they seldom extend their excursions beyond a half-mile from their burrows for fear of the wolves, and many other enemies. The Canis Latrans, on the other hand, is quite a large and savage animal, and frequently unites in bands to run down deer or buffalo calves, but as for living under ground in burrows, it is quite out of reason to suppose such a thing possible with this quadruped, who secretes himself in the depths of the forest, and appears on the open plain only when in pursuit of game.--L.] The habit of selecting large, open, sandy plains, and burrowing there, extends to the greater part of the American wild dogs. [We have been credibly informed by several gentlemen, familiar with the country of Mexico, that there is a diminutive species of dog running wild, and burrowing in the ground as rabbits, in the neighbourhood of Santa Fe and Chihuahua. A gentleman who has seen these animals, states that there is no doubt as to their identity, having met with them in a state of domestication, when they exhibited all the actions and manners of a French lap dog, such as come from Cuba or other West India Islands. They are of every variety of hue, and resort to their burrows whenever disturbed in their natural haunts. What they subsist on it is difficult to say, as they are too harmless and insignificant to attack any other animal beyond a mouse or a snail. They are represented as being very difficult to tame, but when domesticated show no disposition to return to their former mode of life. The lady of the Mexican Minister, when in this city, had one of these dogs as a boudoir pet; it was lively and barked quite fiercely. We have not been able to ascertain whether they bark in their natural state. The breed of dog cultivated in China for food alone, are fed entirely upon rice meal and other farinaceous articles, having no relish whatever for flesh or other strong aliment.--L.] In some parts of North America whole troops of horses are guarded and kept together by dogs. If any of the troop attempt to steal away, the dog will immediately fly after the horse, head him, and bring him back to his companions.