There are transitional forms between the metals and non-metals; between chemical combinations and simple mixtures, between animals and plants, between phanerogams and cryptogams, and between mammals and birds [...]. The improbability may henceforth be taken for granted of finding in Nature a sharp cleavage between all that is masculine on the one side and all that is feminine on the other; or that any living being is so simple in this respect that it can be put wholly on one side, or wholly on the other, of the line.

degree. On October 3 he took a room in the house in Schwarzspanierstraße 15 where Ludwig van Beethoven died. However Wittgenstein's deep admiration of Weininger's thought was coupled with a fundamental disagreement with his position.

Otto Weininger (April 3 1880 – October 4 1903) was a Christian Austrian philosopher. Today Weininger is generally viewed as misogynistic and antisemitic in academic circles[page needed] but was held to be a great genius by the philosopher Ludwig Wittgenstein and the writer August Strindberg (see discussion below).