What is meant by in the poem H W Longfellow?

The phrase "in the poem H W Longfellow" doesn't really make sense. It's likely you're asking about something within a specific poem by Henry Wadsworth Longfellow, but the question is incomplete.

To help me understand what you're asking, please provide more context. For example:

* What poem are you referring to? (e.g., "The Midnight Ride of Paul Revere", "Evangeline", "The Song of Hiawatha")

* What specific phrase or idea are you looking for clarification on? (e.g., "The tide rises, the tide falls", "the village smithy", "the arrow of time")

Once you provide more context, I can help you understand what is meant by the phrase within Longfellow's poem.