back, or capacity of the chest, will constitute a racer; far from
it: but that in any given and proportioned length, from the bosom
of the Horse to the settting on of the dock, the nearer the
superior points of the shoulders approach to the quarters, so much
better able will the carcase be to sustain and bring through the
weight; and as much as the shoulders themselves prevail in depth,
and the quarters and thighs in length, so much greater will be the
velocity of the Horse, because a greater purchase of ground is
hereby obtained at every stroke.

It is by this proprity of length, strength of carcase, and the
power of the muscles, that foreign Horse excel all others, and it
is by the same advantages they excel each other also, and not by
any innate virtue, or principle of the mind, which must be
understood by the word blood, if any thing at all is intended to
be understood by it; and this is a truth every man would be
convinced of, if he would divest himself of partiality to
particular blood, and confide in his own observation of Horses and
their performances.

Sedbury was an instance of this great power, in whom we find all
the muscles rising very luxuriant, and with a remarkable
prominence. The famous Childers was a like instance of it. These
two Horses were remarkably good, but we have been absurd enough to
condemn the blood of both at various times; in one, because he had
bad feet, and entailed that defect on the generality of his
offspring; in the other, because most people who bred from that
lineage, were running mad after a proper cross, when they should
have been employed in thinking only of propriety of shape.