SPAYED BITCH,—is a bitch upon whom an operation has been performed, by which she is deprived the power of generating a farther progeny. An incision being made in the flank, midway between the hip-bone and the belly, the ovaries are extracted through the orifice, and separated from the parts to which they were united: these being returned, the wound is stitched up, and heals in a few days, (if performed by a judicious practitioner,) without farther trouble or inconvenience. SPEED—is sportingly applicable to HORSE, HOUND, or GREYHOUND; and upon this depends (in a great degree) the estimation in which they are held. It is customary to say, such a horse has great _action_, or he is in possession of the _gift_ of _going_. This is, however, considered applicable only to excellent TROTTERS and _hacknies_ upon the road. SPEED is always used in a superior sense, and intended to convey an idea of the greatest rapidity of which the animal is capable, and which enhances his value in proportion to his qualifications. In the art of TRAINING for the TURF, there are ambiguities of such magnitude, that it is averred by those who have made the practical part their study, that one training-groom (from judgment, experience, and observation) shall bring a horse to the post full half a distance better than another, although their _speed_ was considered equal when placed under the racing management of their different superintendants. This is admitted so much, and so truly, an incontrovertible fact, that TRAINING-GROOMS have their lights and shades of reputation and celebrity, in an equal degree with the most eminent artists in the universe. JOCKIES also are admitted to possess their different degrees of excellence, and to so very great and discriminating a _nicety_, that when MATCHES are lost by some lengths, and for large sums, offers are frequently made to run the match over again for the same money, or to _double_ the STAKES, provided the WINNING JOCKEY is permitted to ride the _losing_ horse. Thus speed is not always the same, but is evidently dependent upon contingencies, which the utmost human circumspection cannot always either foresee or prevent. The increase of speed with RACE HORSES in this country, is very readily admitted to have been great during the last fifty years; and this is impartially attributed to the introduction of, and judicious crosses from, the ARABIAN BLOOD with the best bred mares of our own: although the effect of these experiments were held in great doubt for some years, but are now universally acknowledged to have exceeded the utmost expectation, and cannot be supposed to extend much farther.