Augustus Henry Keane, 1911 Encyclopædia Britannica (1911)
“ How profoundly the several groups differ one from tile other even in their structure is evident from the fact that such assumed universal features as unchangeable roots and vowel harmony are subject to numerous exceptions, often spread over wide areas. Not only is assimilation of final consonants very common, as in the Osmanli bulun-mak for the Uighur bulul-mak, but the root vowel itself is frequently subject to umlaut through the influence of suffixed vowels, as in the Aryan family. ”
