Alexander MacBain,
An Etymological Dictionary of the Gaelic Language
(1911)
“ Gaelic belongs to the Celtic group of languages, and the Celtic is itself a branch of the Indo-European or Aryan family of speech; for it has been found that the languages of Europe (with the exception of Turkish, Hungarian, Basque, and Ugro-Finnish) , and those of Asia from the Caucasus to Ceylon,1 resemble each other in grammar and vocabulary to such an extent that they must all be considered as descended from one parent or original tongue. This parent tongue is variously called the Aryan, Indo-European, Indo-Germanic, and even the Indo-Celtic language. ”
