William Ward Pigman, 67, former chairman of the department of biochemistry at New York Medical College, died of a cerebral hemorrhage Sept. 30 at Woods Hole, Mass., while attending a scientific meeting.

Noted for his work in the field of carbohydrates, he earned bachelor's and master's degrees from George Washington University and a doctorate in organic chemistry from the University of Maryland.

Born in Chicago, Dr. Pigman worked his way through Crane Junior College there, coaching basketball. He transferred to George Washington University in 1930 and took a job with the National Bureau of Standards.

From 1930 to 1938, he worked at the bureau as a chemist, doing research on carbohydrates, especially sugars.

In 1938 and 1939, he studied chemistry at the University of Leipzig under a grant from the Lalor Foundation.

Dr. Pigman returned to the National Bureau of Standards in 1940 as a research chemist, working there through 1944, when he left government for private industry.

He became embroiled in the Red spy scares of the late 1940s when he was named by Whittaker Chambers as a source of governmental documents that Chambers transmitted to a Soviet spy ring from 1937 to 1938. Chambers alleged that these papers concerned testing done by the bureau and Dr. Pigman of "secret weapons" and other military devices.

Dr. Pigman testified before the federal grand jury that indicted Alger Hiss on two counts of perjury in December, 1948, and at the Hiss perjury trial of June, 1949. He denied ever knowing Chambers or giving out any unauthorized government information.

No charges were brought against Dr. Pigman.

During the war, Dr. Pigman had been assigned to a project on the Wheat Alcohol Research Committee of the War Production Board, in an effort to find a solution to the wartime shortage of industrial alcohol.

In 1948, he published a book, "Chemistry of the Carbohydrates," which became a popular medical text.

Serving as an associate professor of biochemistry at the University of Alabama Medical Center from 1949 to 1960, he developed an "artificial mouth" that simulated conditions in the mouth for the study of tooth decay.

He then became chairman of the biochemistry department at New York Medical College, a position he held until his retirement in 1975.

He also was dean of the Graduate School of Basic Sciences there from 1963 to 1968.

He was awarded the C.S. Hudson Award of the American Chemical Society in 1959, the Medal of the French Biochemistry Society in 1962, and a University of Milan Medal in 1964.

Dr. Pigman published more than 250 research papers and a number of books.

He was a fellow of the American Association for the Advancement of Science, and a founder and past president of the International Society for Complex Carbohydrates. He belonged to the International Association of Dental Research and the American Society of Biochemists.

He is survived by his wife, Galdys, of the home in Jamesburg, N.J.; a son, James, of Silver Spring; a daughter Jean Lytle, of Sarasota, Fla.; a sister, Doris Pigman, of Chicago, and three grandchildren.

The family suggests that expressions of sympathy be in the form of contributions to the American Cancer Society.