This section is from the book "Hints To Purchasers Of Horses", by Charles Knight. Also available from Amazon: Hints to Purchasers of Horses.
I shall therefore conclude with advising all persons, as the surest way to be fortunate with horses, always to buy those that are young and sound; without blemish, with good action, and most particularly with good mouths; as one of the first things to be observed is, that a horse bend to his bridle. You may just as well ride a pig, as a horse without a mouth; and a wooden horse, as one without action. Be assured, if your horses be purchased with attention to these directions, and you should be at any time, from unforeseen circumstances, compelled to offer them for sale unexpectedly, they will meet with plenty of customers.
Never encumber yourself with screws; they require more attention than sound horses; they do less work; are worth nothing for sale; but contribute to lessen the opinion of your judgment, and bring your stable into confirmed disrepute.
 
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