Both the heavyweight and lightweight varsity crews coasted past all their opposition Saturday, so next weekend Harvard will take this varsities into the Eastern sprints undefeated.

On the Charles, the lightweight varsity winged to a two length victory over On the Schuylkill River in Philadelphia, the heavyweight staved off challenges from both Pennsylvania and Navy who jockeyed for second place as the Crimson look the race by an easy two and a half lengths.

But the Crimson, keeping their stroke at about a 34, eased away to leave the other crews two and a half lengths behind at the finish line. Harvard's time was 6:42.2.

On the Charles, the varsity lightweights almost immediately overcame a two-seat Princeton lead and slowly pulled away from the Tigers. As the Princeton cox frantically urged his crew on, trying to narrow Harvard's two length lead in the last quarter mile, the Crimson appeared almost unconcerned, keeping the stroke low, and clinging stubbornly to their smoothly earned lead.

Princeton upset Harvard's junior varsity in the most exciting race on the Charles Saturday afternoon. The Tigers led the entire way, establishing almost a length over the Crimson in the last 30 strokes of the race. But as coxswain Al Bartlett called the stroke up to a 39. Harvard surged forward and, seat by seat, pulled so close that it was several minutes before the judges decided that Princeton had won by a margin of four-tenths of a second. Yale crossed the finish line eight length behind.

Both the first and second freshman heavies lost their races to Pennsylvania, which has put together an exceptional squad this spring.

The first freshman lights beat Yale by five and a half and Princeton by seven and a half, while the second freshman shell took the Tigers by the amazing margin of nine lengths.