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is asserted with equal confidence, and probably with the same amount of actual proof, that it would be impossible so to improve the wild hog by selection as to render it the equal of the domesticated hog. There must, therefore, have been an infusion of blood of a cultivated breed of pigs to acquire even that amount of success which was noticeable in the improved pig of a century, or less, ago. Unfortunately, for this argument, it has not been possible to obtain any information of value as to the alleged source of origin of this cultivated breed of pigs. Again, those pigs which possess in a marked degree early maturity, fine quality of flesh, and those other characteristics of the improved pig, are so various in colour, that one cultivated breed only could not have been utilised in the general improvement. All the ancient writers on pigs appear to have experienced the same difficulty when endeavouring to discover the sources of origin of the material which might have been used in the production of the pig which in their time was looked upon as the domesticated and improved pig of the period. This difficulty extends even to the present day. So far as is known there exists no actual proof that the domesticated hog has been evolved in any particular way other than by continued selection of those animals for breeding purposes which possessed in the greatest degree those particular qualities held in the highest estimation at the time. Of course, the soil, climate, etc., of the district in which pigs are reared have a certain amount of influence, but this is noticeable to a much lesser extent with pigs than with horses, cattle, or sheep, since under the present system of pig-breeding the greater portion of the food used in the different districts is of a very similar character--indeed, much of it has a common origin--having been imported from abroad. As a rule, comparatively speaking very little difference is noticeable in the development, form, and character of pigs bred in the various parts of the country, whereas with some of the other domesticated animals a very considerable change follows the removal of sheep of a pure breed from one district to another. The quality and quantity of the wool, flesh, and bone are all affected. An exactly similar effect is noticeable when horses of a particular breed are moved from one district to another. For instance, a Shire foal bred in the Fens may possess the characteristic bon
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