A mill without a wheel is a strange thing to be haunted by, yet that is the situation Edward Thomas builds in "The Mill-Water." The building has collapsed: its roof lies "prone," and the nettle "reigns" over the walls. The one survivor is the stream, still pouring over the place where machinery once turned. The poem's central idea is that what outlasts a way of life may not be a monument but a sound. Once night strips away everything else, that sound takes over the mind of anyone who listens.
Thomas sets up the contrast between then and now through personification. The water "toils no more" and "dangles white locks," so the falling stream looks like an old man's hair, aged and aimless. It "mocks / The music of the mill-wheel's busy roar," and the verb is a cruel one, since the present sound is a parody of the old one. Even the weeds get a royal verb. Power has passed from the working mill to the useless nettle.
Day and night then divide the poem. In daylight the water is "pretty to see," but its sound is "naught / Compared with thought / And talk and noise of labour and of play." Human busyness drowns it out. At night, in "Gloom infinite," the sound "comes surging in upon the sense," and the verb makes it sound like a flood. From here the poem turns inward. Whether one is alone or in company, in "Grief or delight," the mind is "by it... haunted or concluded." The twisted word order of "By it must haunted or concluded be" feels as though the sentence itself is being tugged along by the current. The most unsettling idea follows. Silence is not the opposite of this sound but its partner: "Wherever one creeps in the other is." Thoughts are "drowned" by it or climb "out of it," so the mind becomes a swimmer in the stream.
The form supports this. Each of the eight stanzas has four lines rhymed ABBA, so the ending loops back to the opening sound, like water returning to the same fall. The line lengths do something similar. In the first stanza the syllable count runs roughly six, four, four, ten. The short middle lines hold back, and the long last line, "On the prone roof and walls the nettle reigns," spills out like water over a weir. The rhymes are not always tidy either. "Mill" and "wheel" share only a final consonant, and "silentness" chimes only faintly with "is," so the music is slightly off, as if worn down.
The poem is also carefully framed. It opens with "Only the sound remains" and closes with "Only the idle foam." The second "idle" deliberately reverses the earlier "toils" and "busy." Only in the last line do people finally appear, and in the past tense: "Where once men had a work-place and a home." Until then the poem has been all water, weeds and a vague, impersonal "one." Placing "work-place" and "home" side by side suggests that the mill was both livelihood and shelter, and losing it meant losing both. The water is "Changelessly calling," but nobody answers. The word "changelessly" carries the poem's irony, because the water is the one thing unchanged in a place where everything else has changed.
What makes the poem significant is how little it explains. Thomas, who was killed in the First World War, wrote in plain, mostly short words, and the speaker never says "I" or states a feeling outright. The grief is left in the images: white hair, a mocking echo, a thought going under. The poem never claims to be about anything larger than one ruined mill, but its closing picture of an emptied place that keeps on sounding stays with the reader after the final line.