Harvard's undefeated harriers will match speed and staying power against Yale and Princeton at New Haven this afternoon in their climax meet, while Coach Jack Carr's booters will meet an unbeaten and powerful Nassau soccer team at Tigertown tomorrow evening.

Although both the Yale and Princeton cross country teams have been beaten this year, the Nassau runners lost only to a powerhouse N.Y.U. outfit and boast two dangerous men in Dave Little and Ed Burrows, who set a new Princeton 880 mark as a Freshman last year.

Crimson Harriers Favored

With Langy Burwell, Penn Tuttie, and Gene Clark leading the way, Jaakko Mikkola's men will be slightly favored when they tackle the hilly four and one half mile course back of the Yale Bowl.

Captain Howie Mendel's return to the lineup gives the Crimson booters an outside chance to upset the Princeton eleven, which has already disposed o Army, Haverford, Lafayette, Swarthmore, and Cornell.

Booters Have Practice Tilt

Coach Carr sent the squad through its last home practice yesterday in a practice game against at team of graduate school players formed by Nap Hardenberg, star of last year's championship team.

The Yardling booters will meet Worcester Academy on the Business School field Saturday afternoon, and the Freshman harriers will tangle with Yale and Princeton cubs today.