Question

what do you mean by dust of snow ​

Answer 1

The crow and hemlock tree represent sorrow and depression felt by him in this materialistic world. On the other hand the dust of snow is the symbol of natural joy and energy. It means passing through the sad and depressing moments the poet is entering into the time full of joy and optimism.

HoPe iT hElpS uH :-)

Answer 2

The dust of snow is the symbol of natural joy and energy. The dust of snow that the crow shakes off a hemlock tree means passing through the sad and depressing moments the pdet is entering into the time full of joy and optimism.