Various have been the opinions upon the difference of speed between a well-bred greyhound and a racehorse, if opposed to each other. Wishes had been often expressed by the sporting world that some standard could be adopted by which the superiority of speed could be fairly ascertained, when the following incident happened, and afforded some information upon what had before been considered a matter of great uncertainty. In the month of December, 1800 a match was to have been run over Doncaster racecourse for one hundred guineas, but one of the horses being withdrawn, a mare started alone, that by running the ground she might ensure the wager. After having run about a mile in the four, she was joined by a greyhound, which leaped into the course from one side, and entering into the competition, continued to race with the mare for the other three miles, keeping nearly head and head, and affording an excellent treat to the field by the energetic exertions of each. At passing the distance post five to four was bet in favor of the greyhound; when parallel with the stand it was even betting, and any person might have taken his choice from five to ten. The mare, however, had the advantage by a head at the end of the race.