This thesis presents evidence that the Kootenay language is genetically related to the Salishan family of languages. The evidence consists of 129 probable cognate sets which include a word or morpheme in Kootenay compared to a resemblant word or morpheme in one or more Salishan languages. These cognate sets show that a network of sound correspondences exists between Kootenay and the Salishan languages which cannot be explained as entirely the result of linguistic diffusion. A number of the sound correspondences could only have come about if there had existed a common ancestor language for Kootenay and the Salishan languages. The main body of the thesis consists of brief discussions of: the hypothesis of a genetic relationship between Koote...