Is the following the text in question?
“I reined my horse to the precipitous brink of a black and lurid tarn that lay in unruffled lustre by the dwelling, and gazed down—but with a shudder even more thrilling than before—upon the remodelled and inverted images of the gray sedge, and the ghastly tree-stems, and the vacant and eye-like windows.”
If so, the words that are repeated are "and" and "the". In repeating these words, the author creates a sense of foreboding, in which, allowing the reader to share in the speaker's horror and unease.