Commentators have disagreed over the kelpie's aquatic habitat. Folklorists who define kelpies as spirits living beside rivers, as distinguished from the Celtic lakeside-dwelling water horse ("each-uisge"), include 19th-century minister of Tiree John Gregorson Campbell and 20th-century writers Lewis Spence and Katharine Briggs. This distinction is not universally applied however; Sir Walter Scott for instance claims that the kelpie's range may extend to lochs. Mackillop's dictionary reconciles the discrepancy, stating that the kelpie was "initially thought to inhabit ... streams, and later any body of water." But the distinction should stand, argues one annotator, who suggests that people are led astray when an "each uisge" in a "common practice of translating" are referred to as kelpies in English accounts, and thus mistakenly attribute lake-dwelling habits to the latter.