He returned to England in 1840 .
He made progress in an etymological theory , which he believed would supplant that of Horne Tooke , and he embodied it in a work called Glossology , or the Historical Relations of Languages .
Returning to England in 1840 , he made progress in an etymological theory , which he believed would supplant that of Horne Tooke , and he embodied it in a work called Glossology , or the Historical Relations of Languages .