The parasites are, when attentively searched for, to be recognized by the naked eye. Any man, by scratching the roots of the hair upon the mane of a mangy horse, may loosen a portion of scurf; let this scurf be received or cast upon a sheet of white paper. The paper then should be subjected to a strong light; the glare of the noonday sun is to be preferred, as warmth greatly influences the activity of the parasites. Numerous very small shining points may thus be seen moving about the mass in all directions. Those points are the insects, and, considering the easy means we now possess of demonstrating their existence, it seems astonishing that veterinary science was so long before it recognized the true source of the contagion. Even at the last moment, the sight was quickened by the research of a human physician, Dr. Erasmus Wilson; but after that gentleman soon followed Mr. Ernes, veterinarian, of Dockhead. Mange would be far less general than it is, did not the convenience or the prejudice of mankind predispose them to favor a "run at grass." The horse there placed is all at once taken from a stimulating diet, while, the groom being relieved of his charge, foulness accumulates upon the coat. The animal, instead of standing still and feeding upon nourishing provender, has to travel far and to distend the stomach with a watery substance before the cravings of hunger can be appeased and satiety impress the creature with a consciousness that existence has gathered a sufficient support. The quadruped while at grass is necessitated to be eating the major portion of both day and night; little leisure is left from the cravings of appetite for rest or for repose. No comfortable bed is placed beneath the jaded limbs. There may be an open shed under which all the inhabitants of the field are free to shelter themselves from the storms of autumn and from the colds of early morning. That building is, however, generally taken possession of by horned cattle, or by the victor of the steeds, and none but favorites are allowed to share the comfort of the tyrant.