Arthur Bell, a 71-year-old man, was found homeless and disoriented on a Brooklyn street last month, barely standing, his feet frozen. He told paramedics that he was once a ballet dancer in Paris.

"And they went, `Yeah, yeah, yeah,' " recalled social worker Maria Mackin. Bell's medical chart, after all, noted possible signs of dementia.But during the days that followed, Bell would tell Mackin tales of Paris and London, Frederick Ashton, Margot Fonteyn, Olga Preobrajenskaya, Katherine Dunham and James Baldwin.

"He started telling me things that only someone who was really in the dance world would know. And I thought, `This is not dementia,' " said Mackin, who happened to have been a ballet photographer at one time. She also saw that Bell was "incredibly graceful . . . slender, sleek."

The accuracy, the richness of detail and the clarity with which he spoke led her to the New York Library for the Performing Arts at Lincoln Center.

Bell's story checked out.

He had been a pioneering black ballet dancer. Though he was no star, he left his artistic mark on the 1940s and '50s, "when there was no place for African-Americans in classical ballet," said Madeleine Nichols, curator of the dance collection at the library.

Bell worked odd jobs after his dance career ended but can't remember how he wound up on the street, where he had been living for months in the dead of winter. His last address was a men's shelter. He would have been sent back there had Mackin not intervened.

Now he's in a nursing home, recuperating from frostbite on his feet and legs. Slowly, he's learning to walk again with a cane. He uses a wheelchair most of the time.

Bell speaks of dance with a lucid passion that awakens his frail, 5-foot-11 body. He arches his long neck and uses his long fingers to punctuate his remarks with lively elegance.

The eldest of a Florida preacher's nine children, Bell finished high school and got on a bus to New York. He quickly found a job in the garment district and started taking dance classes with Dunham.

He moved to Paris in the early '50s, where he said he lived in the same rooming house as Baldwin, the writer. He danced with the Ballets de la Tour Eiffel while studying with Preobrajenskaya, the retired Russian ballerina.

In 1950, Ashton, the great British choreographer, chose him as a guest soloist in the New York City Ballet's world premiere of "Illuminations."

Bell returned to New York in the '60s, forced to give up his career as he approached 40. His life slid away.

Not being able to dance anymore doesn't trouble him, he said, "because when you love something, the love for it just goes beyond anything. Dancing is in my soul."