There are two modes of trial for SPEED, according to the present reformed mode of English racing: the one is to run _a mile_, which is termed running for SPEED; the other, of _going off_ at SCORE, and absolutely racing the whole _four miles_, which is called running for _speed_ and _bottom_. _Flying Childers_, whose speed was almost proverbial, went one third of a mile in twenty seconds. _Firetail_ and _Pumpkin_ ran a mile in a few seconds more than a minute and a half. _Childers_ ran the distance of four miles in six minutes and forty-eight seconds, carrying nine stone, two pounds; he made a leap of _thirty feet_ upon level ground; and he covered a space of twenty-five feet at every stroke when racing. It was formerly known that any horse who could run four miles in eight minutes, would prove a WINNER of PLATES: this is, however, very materially refined, by judicious crosses in blood, or improvements in training; as _Bay Malton_ ran four miles over York in seven minutes, forty-three seconds and a half. _Eclipse_ ran the same distance over York in eight minutes with _twelve stone_, though going only at his rate, without any inducement to speed. The means by which the wonderful velocity of the greyhound can be ascertained are but few: there are, however, well authenticated instances upon record; and as they are again quoted in MR. DANIELS "Rural Sports," are entitled to credibility. In February, 1800, a hare was darted before a brace of greyhounds in Lincolnshire, and upon the distance being measured from her form to where she was killed, it proved upwards of four miles in a direct line; but there having been several turns, as well as some oblique running, during the course, it must have increased the length considerably: this ground was run over in the space of _twelve_ minutes; and the hare fell dead before the greyhounds touched her; which serves to demonstrate the speed and strength of the former. It is known that horses are more distrest (if they keep up) in a moderate COURSE than in a long CHASE; of which an instance lately occurred in the neighbourhood of Bottisham, in Cambridgeshire, from whence the hare being started, took away for the Six Mile Bottom; and although two-and-twenty horses went off with the greyhounds, only one could make a _gallop_ at the conclusion of the course. The hare (who had reached within fifty yards of the covert) dropped dead before the greyhounds; and they were so exhausted, that it was found necessary to bleed them to promote their recovery.