The offspring of these crosses will be grades; but grades are often better for the practical purposes of the farmer than pure-bred animals. The skill of the breeder is especially manifest in the selection of animals to breed from, since both parents undoubtedly have a great influence in transmitting the milking qualities of the race. But this method of improvement requires less exact and critical knowledge than the first, from the fact that it is easier to appreciate the good points of an animal already perfected, or greatly improved, than to discover them in animals which it is our desire to improve, and which are inferior in form, possessing only the elements of a better stock. It has also an immense advantage, since results may be far more rapidly attained, and improvements effected which, by the first method,--that of creating or building up a race from the so-called natives, by judicious selections,--would be looked for in vain in the ordinary life of man. All grades are produced by this second method; but all grades are not equally good, nor equally well adapted to meet the farmer’s wants. It is desirable to know, then, what, on the whole, are the best and most profitable to the practical farmer. We want cattle for distinct purposes, as for milk, beef, or labor. In a large majority of cases,--especially in the dairy districts, comprising the Middle and Eastern States, at least,--the farmer cares more for the milking qualities of his cows, especially for the quantity they give, than for their fitness for grazing, or aptness to fatten. These latter points become more important in the Western and some of the Southern States, where far greater attention is paid to breeding and to feeding, and where comparatively little attention is given to the productions of the dairy. A stock of cattle that might suit one farmer might be wholly unsuited to another; and in each particular case the breeder should have some special object in view, and select his animals with reference to it. But there are some general principles that apply to breeding everywhere, and which, in many cases, are not well understood. It would not be desirable, even if it were possible, by crossing, to breed out all the general characteristics of many of our native cattle. They have many valuable qualities adapted to our climate and soil, and to the geological structure of the country; and these should be preserved, while we improve the points in which many of them are deficient, such as a want of precocity and aptitude to fatten, where it is an object to attain this quality, coarseness of bone, and lack of symmetry, which is often apparent, especially when the form of the animal does not indicate a near relation to some of the established breeds.