While his new teammates mourned the loss of an old friend, Steve Henderson did his best to help ease the pain Thursday night.

Henderson, a 24-year-old outfielder who was one of the men obtained from Cincinnati Wednesday night in the trade for Tom Seaver, made his major league debut with the New York Mets Thursday and flashed his base-running ability in a 4-3 triumph over the Houston Astros.

The speedy Henderson was inserted itto the game in the seventh inning as a pinch runner for Ed Kranepool and took second on a two-out single by Felix Millan. A moment later, he and Millan dashed home when shortstop Joe Gonzalez threw Mike Vail's grounder wildly into right field after trying to get a force out at second.

"I was very excited at the opportunity to help," said Henderson, who was the only one of the players the Mets acquired Wednesday night to arrive for Thursday night's contest. "I'm glad to be here, I was kind of nervous early this evening, but once the manager (Joe Torre) put me in the game, I felt okay."

Henderson struck out in his only at bat in the eigth inning, but Toree said he would start the youngster in left field tonight.

In other Thursday night games: