Seeing then, this is the case, how shall we account for the
various perfection and imperfection in the breed of these foreign
Horses; for we perceive it not determined to those of Turkey,
Barbary, or Arabia, but from each of these countries some good,
some bad Stallions are sent us? What shall we do? Shall we
continue to impute it to the good old phrase of blood, the
particular virtue of which, no man ever yet could ascertain, in
any one particular instance, since Horses were first created? or
shall we say that nature has given these foreign Horses a finer
texture, a finer attitude, and more power than any other Horses we
know of; and that these very Horses, and their descendants always
did, and always will surpass each other in speed and bottom,
according to theit different degrees of power, shape, elegance,
and proportion? But there is also a certain length determined to
some particular parts of this animal, absolutely necessary to
velocity, of the particularity and propriety of which length, all
jockeys appear to be intirely** ignorant, from the latitude of
their expression, which is that a racer must have length
somewhere.

If I might now be allowed to give my opinion of this propriety of
length, I should say it consisted in the depth and declivity of
the shoulders, and in the length of the quarters and thighs, and
the insertion of the muscles thereof. The effect of the different
position or attitude of the shoulders in all Horses, is very
demonstrable: if we consider the motion of a shoulder, we shall
find it limited to a certain degree by the ligamentous and the
tendinous parts, which confine it to its proper sphere of acting;
so that if the shoulder stand upright, the Horse will not be able