The system of breeding _in-and-in_ proves, in fact, as destructive to flocks, as marriages of near relations to the human kind. We would not witness an every-day entailment of diseases, if people would forego their unnatural love of money, and cease their endeavours to keep it in "the family," by forming matrimonial alliances with those who are near of kin. The law of God forbids us to wed those who stand in certain degrees of propinquity; but, if we and our descendants avail ourselves of the limits of this law, and marry on its verge a certain number of times, misery must infallibly be the lot even of the tenth generation; and instead of being fathers of a mighty people, few and full of sorrow will be the days of our children; while in place of retaining in their possession our darling wealth, it will, ere long, pass into the hand of the stranger. (88.) _Opponents of in-and-in breeding._--Different individuals at various times, and in widely separate places, have by their observations rendered the criminal absurdity of this system perfectly apparent to all, who, unbiased by party principle, are anxious for a knowledge of the truth. A few of these I shall mention. Ezra L'Hommedieu, Vice-president of the Agricultural Society of New York, collected, in the year 1800, a great many observations on the breeding of sheep, and came to the conclusion, that changing and crossing the breed of the animals is a matter of great importance, in preventing a dwindling and degeneracy of the flock. Dr Coventry, in his pamphlet on _Live-Stock_, gives it as his opinion, that "The most perfect race of animals may be debased by improper mixture, or injured by improper treatment. Indiscriminate matches in breeding, and inattentive management in rearing, are alike capable of producing a worthless progeny." Here the matter is made very plain, from comparing an evil, the progress of which is insidious, with the injurious consequences, which the most unobserving can easily trace to a parallel neglect. Mr Dick of Edinburgh, so well known for the valuable and trustworthy information he has accumulated, has been informed by eminent farmers, "that cattle bred _in-and-in_, are very subject to _clyers_ in the throat after they have attained their first year." By clyers are meant enlarged lymphatic glands, which are a sure sign of what is termed a scrofulous habit, a breaking up of the constitution, which, though produced by a variety of causes, is yet frequently the result of an "_owr sib_" connection. These are, I may say, the accidental opinions of men who had no point to make good, in which their credit was at all at stake, and who are not endeavouring to support the crude opinions of former years. For these reasons, they possess a value which ought to give them a proportional weight in an investigation like the present. Mr Bakewell succeeded in bringing his sheep to great perfection as regards form, and rapidity of fattening, by breeding in