The remarks of Professor S. are valuable to the American farmer. First, because they throw some light on the character of a disease but imperfectly understood; secondly, they recommend a safe, efficient, and common-sense method of treating it; and lastly, they recommend such preventive measures as, in this enlightened age, every farmer must acknowledge to be the better part of sheep doctoring. The reader will easily perceive the reason why the food of sheep is injurious when wet or saturated with its own natural juices, when he learns that the digestive process is greatly retarded, unless the masticated food be well saturated with the gastric fluid. If the gastric fluid cannot pervade it, then fermentation takes place; by which process the nutritive properties of the food are partly destroyed, and what remains cannot be taken up before it passes from the vinous into the acetous or putrefactive fermentation; the natural consequence is, that internal disease ensues, which often gravitates to the feet, thereby producing rot. This is not all. Such food does not furnish sufficient material to replenish the daily waste and promote the living integrity. In short, it produces debility, and debility includes one half the causes of disease. It must be a matter of deep interest to the farmer to know how to prevent disease in his flock, and improve their condition, &c.; for if he possessed the requisite knowledge, he would not be compelled to offer mutton at so low a rate as from three to four cents a pound, at which price it is often sold in the Boston market. We have already alluded to the fact that neat cattle can, with the requisite knowledge, be improved at least twenty-five per cent.; and we may add, without fear of contradiction, that the same applies to sheep. If, then, their value can be increased in the same ratio as that of other classes of live stock, how much will the proprietors of sheep gain by the operation? Suppose we set down the number of sheep in the United States at twenty-seven millions,--which will not fall far short of the mark,--and value them at the low price of one dollar per head: we get a clear gain, in the carcasses alone, of six millions seven hundred and fifty thousand dollars. The increase in the quantity, and of course in the value, of wool would pay the additional expenses incurred. It is a well-known fact that, when General Washington left his estate to engage in the councils of his country, his sheep then yielded five pounds of wool. At the time of his return, the animals had so degenerated as to yield but two and a half pounds per fleece. This was not altogether owing to the quality of their food, but in part to want of due care in breeding.