HART-JOHNSON BOUT.San Francisco, Cal., .March 27—Marvin Hart, of Louisville, and .Jack Johnson, the clever heavyweight fighter, will meet in a twenty-round bout before the Hayes Valley club tomorrownight and the Hart crowd is displaying a great deal of confidence over the outcome. Hart has trained with Jim-my Britt as a sparring partner and is in first class condition. The same is said of Johnson, who has been doing his practice work in company with Jack McCormick and Denver Ed Martin. Interest in the fight is increased by the opinion that the winner will probably contest with Jeffries at an early date for the heavyweight championship. do-