26th April, 8.30 pm: a fifth son, Ludwig Josef Johann Wittgenstein, the youngest of eight children, is born to Poldy and Karl in their house at Neuwaldegg, then on the outskirts of Vienna (McGuinness, 2nd edition, p.viii; Kanterian, p.14). He is baptised in his mother’s faith, as a catholic (Richter, p.xxi).
LW and his siblings are brought up by an unsympathetic nursemaid, Fraülein Elise, until LW is six years old (McGuinness, p.27).
Karl arranges a private performance of Johannes Brahms’ clarinet quintet in the Alleegasse house, in Vienna, which Brahms attended (McGuinness, p.19).
LW starts speaking, at around the age of four (Monk, p.12).
(Also in 1893: Publication of the first volume of Frege’s Die Grundgesetze der Arithmetik [The Basic Laws of Arithmetic]).
LW is educated at home by private tutors, according to his father’s wishes, until the age of 14 (McGuinness, pp.24-5). He receives formal religious instruction from a priest, for example (McGuinness, p.43).
Karl acquires the Hochreit, near Hohenberg, Lower Austria, a country estate and hunting lodge in the mountains not far from Vienna, where the Wittgenstein family proceed to live each Summer (Wiener Ausgabe, p.14, Wittgenstein in Cambridge, p.32, note). He acquired and developed it mainly for his eldest daughter, Hermine (McGuinness, pp.29, 46).
LW’s childhood and early youth are spent in Vienna and at the Hochreit.
(Also in 1894: Posthumous publication of Heinrich Hertz’s Die Prinzipien der Mechanik [The Principles of Mechanics]).