The best and most approved season for letting the mare take the horse, where the produce is bred for general purposes, is from the first week in MAY to the last in JUNE; as then the offspring is dropt in APRIL or MAY in the following year, and are the properest months a foal can fall in, to have the advantage of all the summer for growth and expansion, preparatory to the drawback of WEANING, and the ensuing severity of the winter. Mares during the time of GESTATION, are liable, but very little subject to ABORTION; reasonable work, and moderate exertions, affect them but slightly in that way; nor does the disappointment but seldom happen, unless by some severe, cruel, or inhuman treatment. MARES are the most uncertain of all animals in bringing forth from the time of conception. Numerous attempts have been made to discover the precise time of a mare's carrying her foal, which, however, does not yet appear to have been ascertained to a certainty. Long-standing opinions and authority, transmitted from one posterity to another, has established at eleven months and as many days as the mare happens to be years old: strict attention, in a variety of instances, to both the LUNAR and CALENDAR months, has proved the uncertainty of this calculation, and left them, in those events, dependent upon neither _one_ or the _other_. Certain it is, they go many days longer with a COLT FOAL than they do with a FILLY; and cases frequently occur, where a mare carries her foal within a few days of the twelve months. MARK!—a term used by SPORTSMEN, particularly in COVERT SHOOTING, where they are necessarily separated from each other; when one of the party, having _sprung_ a PHEASANT, or _flushed_ a COCK, (at which he either did not get a _shot_, or missed his _aim_,) he then vociferates the signal, MARK! in a hope his companion may get a shot, or _mark_ the spot near where he alights, to insure a better chance of his recovery. It is also used in partridge shooting, where hedges or hedge-rows interrupt the sight, or divide the parties. MARK IN THE MOUTH.—The black cavity in the TEETH of a HORSE, by which his age is correctly known till seven years old, is called the _mark_; when which is obliterated, the age can be no longer precisely ascertained. DEALERS adopt a successful mode of _deception_, by which the young and inexperienced are frequently imposed upon. See BISHOPING and COLT. MARK ANTHONY,—the name of a horse of some celebrity as a RACER, and equal to any horse of his time: he was bred by MR. C. BLAKE, and foaled in 1767: he was got by that known good horse _Spectator_ (who was got by _Crab_) out of _Rachel_, (who was got by _Blank_;) her dam by _Regulus_, grand-dam by _Soreheels_. He acquired some reputation as a STALLION, and was the sire of several good runners.