(74.) _The proper Temperature required for Sheep._--Regular warmth is absolutely necessary for the production of a good animal and a fine fleece, and is only to be obtained by attending to the draining and clearing of land, so as to dissipate moisture, and allow currents of air to play freely across the country.[12] An atmosphere which holds suspended a large quantity of watery vapour, is always extremely chilling to an animal body. This is accounted for by the well-known fact, that a moist air, being a better conductor of caloric than a dry one, robs an animal more quickly of heat. Thus, in passing from the dry air of the hills into the vapour of the valleys in a winter morning, we feel as if the transition had been from a temperate to an icy region. Hence one of the reasons why sheep thrive best in a rather elevated situation. Moist air, however, is exceedingly oppressive in hot weather, because evaporation, from the surface of the body, is to a great extent diminished; and it is only by the perspiration being allowed to escape rapidly, and to convey away the heated particles, that we can manage to be in any degree comfortable during the heat of summer. This free evaporation we endeavour in every way to obtain, and often in a manner that ignorant people would consider as the reverse of sensible. It is well known that draughts of _cold liquids_ are very far from answering the purpose of lowering our temperature when above a pleasant standard; but we find that a basin _of hot soup, or tea_, will speedily bring about the desired end, by producing a copious determination of fluid to the skin. Yet, if the air contained no moisture, we should experience sensations just as unpleasant as those already mentioned; for evaporation from our bodies would proceed at such a rate, that we would soon be parched. It is to counteract this tendency of dry air that the Americans are in the habit of placing a small vessel of water on their stoves, by which contrivance a quantity of vapour is diffused through the apartment, sufficient to balance the loss from the arid warmth of the fire. [12] It is to secure equality of temperature that the Spanish flocks are twice in the year exposed to the hazard of an overland journey of 400 miles, that they may pass the summer in the mountains of the north, and the winter in the southern plains.