What is a "dust of snow"? What does the poet say has changed his mood? How has the poet's mood changed?
"Dust of snow" refers to the fine, powdery particles of snow that were sitting on the hemlock tree.
The poet says that the dust of snow falling on him, which was shaken down by a crow from a hemlock tree, has changed his mood.
The poet's mood changes from sorrow and regret to positivity. The falling snow gives his heart a change of mood and saves some part of a day he had previously rued (held in regret).
Explanation
The poem 'Dust of Snow' by Robert Frost illustrates how a small, seemingly insignificant moment in nature can alter a person's state of mind. 'Dust of snow' represents the tiny snow particles. The crow shaking it down from the hemlock tree acts as the catalyst for the change. The glossary defines 'rued' as held in regret, which indicates the poet's initial negative mood. The simple act of the snow falling on him transforms this regret, saving the day from being entirely ruined.