Answer:
personification
Explanation:
Personification is one of the types of figurative language. It is used when an innate object or non-human object is treated as a human being. In the given excerpt from the poem “The First Snowfall” written by James Russell Lowell, the figurative language used is personification. The "pine and fir and hemlock" are said to wear 'ermine'. These are the names of the trees who are personified as human beings. Hence, this is an example of personification.