Interesting question, David. The paper identifies him as "Red" Glennon. A quick Google search found this from a February 1915 Boston Globe article about him:
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Thousands of Red Sox fans will be interested in the announcement that William Joseph Glennon, the 13-year-old youngster with the deep-red hair, who was seen on the diamond every afternoon that the Boston team played in Boston last season, has been "signed" as a member of the team for the coming year in the capacity of mascot.
He is known as "Red" by his playmates, but this name has not the approval of his mother, who is naturally proud of the signal distinction of her son, coming as it does direct from Pres Lannin. The new mascot is left-handed, and she says "Lefty" is much better; so "Lefty" Glennon his name will henceforth be to Boston baseball enthusiasts.
"Lefty" Glennon is a freshman at Boston College High School; he is a bright student and well liked. He was "graduated" into the major league from a local team, the Red Sox of Jamaica Plain, an organization fostered by one of the curates of the St Thomas parish, in which he lives at 16 St Rose st.
On this team, which claimed the 12-13-year-old championship of Greater Boston, he played in centerfield and played it well, according to the fans of the neighborhood. These same experts figure also that the rise of the Red Sox near the end of the season last year was due to the daily attendance of young "Lefty."
Pres Lannin's letter notifying "Lefty" of his appointment states the hope that the team will play its way to success the coming season as a result of its mascot.
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