In Katherine Mansfield's story "The Fly," Macey is the boss's "grey-haired office messenger." He is an older man with a doglike attitude who seems to live to serve the boss in whatever way the latter requires.
The first time we see Macey, the boss is telling him that he will see no one for a half hour. His friend Woodifield has just told him that Woodifield's daughters have been to Belgium and saw both of their sons' graves. This conversation is jarring to the boss, and he needs some time alone. Therefore, he tells Macey that he is not to be disturbed. Macey's only words are "Very good, sir."
The boss then allows himself to sink into his memories. He recalls how his son had been learning the business before the war and how everyone "down to old Macey couldn't make enough of the boy." It was Macey who handed the boss the telegram informing him of his son's death. We do not hear anything about Macey's reaction to the news, only about the boss's grief, yet we can infer that because of Macey's fondness for the young man, he, too, grieved.
Macey appears one more time at the end of the story when the boss asks him to bring "some fresh blotting-paper." Macey is again described as an "old dog," and this emphasizes both his loyalty to the boss and his consistent service. Indeed, Macey appears to be a reliable constant in the boss's life.