Israel Abrahams, 1911 Encyclopædia Britannica, Volume 11… (1911)
“ He further maintained that the origin of the Indo-Germanic language is to be sought not in Asia but in central Germany. He was a convinced opponent of rationalism in religion. His chief work was his Ursprung und Entwickelung der menschlichen Sprache und Vernunft (vol. i., Stuttgart, 1868) , the principal results of which appeared in a more popular form as Der Ursprung der Sprache (Stuttgart, 1869 and 1878) . ”
