This section is from the book "Hints To Purchasers Of Horses", by Charles Knight. Also available from Amazon: Hints to Purchasers of Horses.
Always have the horse you are about to purchase shown quietly; because, when he is agitated, a slight lameness may escape your observation; and always see him ridden, that you may judge how he wears himself, and how he uses his legs and feet; for many horses are pleasant to ride, that are unpleasant to look at when ridden; and dealers never fail to put you immediately upon their backs, when their riding is pleasanter in the feel, than in the appearance. I may here also mention, that whatever pace the horse, when you see him ridden, is continually kept in, that pace is his best; and whatever he is hurried out of, he cannot do at all, or be well assured that no opportunity would be lost of exhibiting it.
 
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