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He captures something of C. S. Lewis in The Lord of the Rings. The character Treebeard makes an unusual “Hrum, Hroom” sound when he speaks. This was Tolkien’s attempt to capture the “booming voice” of Lewis. The identification of Lewis with this wise and ancient tree-man should be seen as high praise, indeed, for Tolkien’s love for trees is evident throughout his writing. More
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Diana Pavlac Glyer (Bandersnatch: C. S. Lewis, J. R. R. Tolkien, and the Creative Collaboration of the Inklings)