Definition of Tone
The tone of “A White Heron” is a reverent and compassionate one. The narrator clearly has a love for nature the way that Sylvia does, and it comes across in the many moments where they describe nature with rich imagery. The narrator also has a lot of compassion and care for Sylvia, turning into a sort of cheerleader for her in moments like the following (when Sylvia is at the top of the old pine tree):
Now look down again, Sylvia, where the green marsh is set among the shining birches and dark hemlocks; there where you saw the white heron once you will see him again; look, look! a white spot of him like a single floating feather comes up from the dead hemlock […] And wait! wait! do not move a foot or a finger, little girl, do not send an arrow of light and consciousness from your two eager eyes, for the heron has perched on a pine bough not far beyond yours, and cries back to his mate on the nest and plumes his feathers for the new day!