[1] E. Meyer, _Sitzungsberichte der Berliner Akademie_ (1908, pp. 14
ff.), and more fully in _Kuhn's Zeitschrift_ (xlii. pp. 17 ff.); also
_Geschichte des Altertums_ (i. 2, 2nd ed. pp. 807 ff.).
[2] Sieg und Siegling, "Tocharisch, die Sprache der Indoskythen"
(_Sitzb. d. Berl. Ak._ 1908, pp. 915 ff.).
[3] No. xix. p. 255, "Another ancient and extensive class of
languages, united by a greater number of resemblances than can well
be altogether accidental, may be denominated the Indo-European,
comprehending the Indian, the West Asiatic, and almost all the
European languages."
[4] Leo Meyer, "Über den Ursprung der Namen Indogermanen, Semiten und
Ugrofinner," in the _Göttinger gelehrte Nachrichten,
philologisch-historische Klasse_, 1901, pp. 454 ff.
[5] The vocative is not strictly speaking a case at all, for it
stands outside the syntax of the sentence. It was originally an
exclamatory form consisting of the bare stem without case suffix. In
the plural the nominative is used to supply the lacking vocative
form.
[6] For the history of the controversy see the excellent summary in
Salomon Reinach's _L'Origine des Aryens: Historie d'une controverse_
(1892). Max Müller's latest views are contained in his _Biographies
of Words and the Home of the Aryas_ (1888). See Schmidt's _Die
Urheimat der Indogermanen und das europäische Zahlsystem_ (1890).
[7] "Geographische Prüfung der Tatsachen über den Ursprung der Völker
Europas" (_Berichte der k. sächsischen Ges. d. Wissenschaften_, 1900,
pp. 34 ff.).
[8] See the essay on "Evolution and the Science of Language," in
_Darwin and Modern Science_ (1909), p. 524 f.