Elizabeth Holmes Johnson, 91, a teacher for many years at the National Cathedral School for Girls, died of a heart ailment Monday at Washington House in Alexandria, where she had resided for about six years.

She taught history at the school from 1928 until her retirement in 1957. She had helped organize the National Cathedral School Chapter of the Cum Laude Society.

Miss Johnson had published "A Guide for the Study of Far Eastern History," which was used by a number of preparatory schools as well as in his history class.

After her graduation from Smith College in 1913, she went to China, where she taught history and English at the University of Nanking. While in China, she was the hostess at one point for her brother, Nelson Trusler Johnson, after he opened the first American consulate in Changsha.

Miss Johnson was born in Washington. She attended Sidwell Friends School and graduated from a private school in Massachusetts. After teaching in China, she returned to this country and received a master's degree from Columbia University in 1925.

She taught Latin and English at Wilson College in Chambersburg, Pa., before coming to the National Cathedral School.

There are no immediate survivors. It is suggested that expressions of sympathy be in the form of contributions to the scholarship fund of the National Cathedral School.