Bertie C. Mason, the seventh child of James Henry Mason I and Mary Carman, was born 21 April 1873. She was the first of the Mason children to be born in Atlantic City. The origin of her name is shrouded with the passage of time, but an often repeated story credits her older brother, James Henry Mason II, with naming her. According to family stories, her brother was given permission to name his new baby sister and he chose the name "Birdie." In complying with their son's selection, the Masons gave their baby daughter the name but spelled it "Bertie." No one ever recalls hearing what the middle initial"C" stood for.
In her youth, Bertie Mason attended the public schools of Atlantic City where she was a classmate of her future sister-in-law, Marian Hargreaves Smith.
Bertie, we are told, was distrustful of men and consequently never married. Like so many members of the Mason family she loved children despite the fact she never had any of her own. She was especially fond of her grand-nephew, Willard Mason Rogers, and enjoyed pushing him in his carriage.
In her 38th year, Bertie developed a carbuncle which became infected. Blood poisoning resulted and she died at her parents' home on 2 March 1912. Following funeral services at St. Paul's Methodist-Episcopal Church, her body was conveyed by a special funeral train to the Atlantic City Cemetery in Pleasantville, New Jersey where she was buried in the Mason family plot.

Memorial:
IN LOVING REMEMBRANCE of our dear daughter aand sister, Bertie Mason, who departed this life March 2nd 1912.
Dearest one thou has left us,
And the loss we greatly feel.
But t'was God that has bereft us,
He can all oursorrows heal.
Yet again we hope to meet her
When the day of grace has fled,
Then in Heaven with joy to greet her.
Where no farewell tears are shed.
Deeply love and sadly missed by
FATHER, MOTHER, BROTHERS and SISTERS.

Mason. On March 2, 1912, Bertie C. Mason, age 38 years, daughter of James H. Sr. and Mary Mason. Relatives and friends of the family are respectfully invited to attend the funeral services on Tuesday afternoon at 2 o'clock at St. Paul's M. E. Church, Pacific & Ohio avenues. Interment Pleasantville cemetery, via special train.
Source: Atlantic City Daily Press, Monday, March 4, 1912, page 4.