We have always looked upon 'Planet "as ihe fastest horse ever 4'oaled in Virginia, and be lieve he could have beat any other horse in the Union when at Ashland last fall: but we are not so sanguine ot his speed and endurance as to suppose that he can travel hundreds of miles by rail, undergo the change of climate arid of water of the South, run all distances, and against all competitors, and never lose a