Secondly, it is highly essential that there should be regularity in _the amount_ fed. The consumption of hay will, it is true, depend much upon the weather; the keener the cold, the more the sheep will eat. In the South, much depends upon the amount of grass obtained. In many places, a light, daily foddering supplies; in others, a light foddering placed in the depository racks once in two days, answers the purpose. In the steady cold weather of the North, the shepherd readily learns to determine about how much hay will be consumed before the next foddering time. And this amount should, as near as may be, be regularly fed. In feeding grain or roots, there is no difficulty in preserving entire regularity; and it is vastly more important than in feeding hay. Of the latter, a sheep will not over-eat and surfeit itself; of the former, it will. Even if it be not fed grain to the point of surfeiting, it will expect a like amount, however over-plenteous, at the next feeding; failing to receive which, it will pine for it, and manifest uneasiness. The effect of such irregularity on the stomach and system of any animal is bad; and the sheep suffers more from it than any other animal. It is much better that the flock receive no grain at all, than that they receive it without regard to regularity in the amount. The shepherd should _measure_ out the grain to the sheep in all instances, instead of _guessing_ it out, and measure it to each separate flock. EFFECT OF FOOD. Well-fed sheep, as has been previously remarked, produce more wool than poorly fed ones. No doctrine is more clearly recognized in agricultural chemistry than that animal tissues derive their chemical components from the same components existing in their food. Various analyses show that the chemical composition of wool, hair, hoofs, nails, horns, feathers, lean meat, blood, cellular tissue, nerves, etc., are nearly identical. The organic part of wool, according to standard authorities, consists of carbon, 50.65; hydrogen, 7.03; nitrogen, 17.71; oxygen and sulphur, 24.61. The inorganic constituents are small. When burned, it leaves but a trifling per cent. of ash. The large quantity of nitrogen contained in wool shows that its production is increased by highly azotized food; and from various experiments made, a striking correspondence has been found to exist between the amount of wool and the amount of nitrogen in food. _Pease_ rank first in increasing the wool, and very high in the average comparative increase which they produce in all the tissues. The increase of fat and muscle, as of wool, depends upon the nature of the food. It is not very common, in the North, for wool-growers to fatten their wethers for market by extra winter feeding. Some give them a little more generous keep the winter before they are to be turned off, and then salt them when they have obtained their maximum fatness the succeeding fall.