Barn swallows spend their winters in far-off places and come back each spring to the same barns, and Trombly's poem begins from that fact with a striking image: "Swallows carry far lands in their wings." The birds seem to bring the distant world into the loft with them, and the rest of the poem works out what that arrival does to the person watching. The answer is a little surprising. The speaker is stirred, even unsettled, by the swallows, and then he deliberately settles back into the ordinary life of the farm.
The first half of the poem is full of motion, and the language moves with it. "Dips, fluttering turns, and wide windy curves" has no main verb and simply piles up movements, the way the birds themselves seem to pile up flight on flight. The repeated w and l sounds give the line a rushing, airy feel. Then the poem draws in close: the swallows sit on a rope that "swerves / For their twisting, twittering heads, their bobbing / Tails." The sound-play of "twisting, twittering" imitates the bird's constant fidgeting, and the comparison of the tails to "a needle seeking its pole" is a lovely precise touch. A compass needle trembles before it finds north, and so do the swallows' tails. The image also quietly plants an idea of direction and homing that matters later.
The turn comes with "I envy them none of this." The speaker admits he does not covet the birds' grace or their sweet song. What troubles him is something else: "their throbbing / Recapture in spring of the haunts I would make my goal." The word "throbbing" is a good choice, since it makes the birds' return sound like a pulse, something felt in the body rather than merely seen. They return to their old haunts with certainty, while the speaker has haunts he would make his "goal," which suggests a place or a life he has not reached. The poem never says what those haunts are. Judging by the imagery, the longing is for somewhere far away or somewhere lost, but Trombly leaves it deliberately vague, and that vagueness is what lets the feeling read as universal rather than tied to one story.
The ninth and tenth lines state the effect most openly: the sight and sound of the birds "knocks at the heart, / And something which slumbered wakes with a start." The heart is pictured as a door, and the longing as a sleeper jolted awake. The rhyme of "heart" and "start" lands the moment with a small, sharp click, and the stress falls hard on both words.
Then the poem does something unexpected. Instead of following the longing outward, it pulls back to the barn: "More musically dances the milk in the pail; / The old dog barks faintly—at nothing, wagging his tail." The sudden shift from the sublime to the domestic could be read as a joke, but it feels more like a decision. The speaker answers the restless, far-reaching feeling by noticing what is near, and he claims that the milk dancing in the pail is more musical than the swallows' song. That claim is a little defiant, as if he is persuading himself. The old dog adds to this. He barks "faintly" and "at nothing," yet he wags his tail, content with a world that needs no explanation. The dash before "at nothing" makes the line hesitate, then settle into peaceful absurdity.
The form supports this. The poem is built from rhyming couplets and alternating rhymes (the opening lines rhyme wings/sings and curves/swerves), and the lines are long and loose, close to speech, with a rolling rhythm that mirrors the birds in the first half and relaxes in the final couplet. The ending feels almost like an exhale after the lurch of the awakened heart.
What makes the poem worth reading is its honesty about a mixed feeling. It does not pretend that wonder and contentment are the same thing, and it does not choose one cleanly. It lets the longing wake, admits its force, and then sets beside it a humble, warm, slightly comic scene of farm life. The poem suggests that the restless heart and the quiet barn can share one afternoon, and that the second may be the way we survive the first.