[142] Loc. cit. pp. 199-200.
[143] Quarterly Journal of Microscopical Science, January, 1873, p. 74.
[144] Loc. cit. p. 64.
[145] Loc. cit. pp. 69-70.
[146] Loc. cit. pp. 16-17.
[147] This quotation is from his Matter and Force, Chapter XIX. Büchner is never tired of emphasizing the Materialism of thought. In an address prefixed to his tenth Edition, speaking of the hypothesis of Mind acting on Brain he calls it "the tragi-comic pianoforte theory," and regrets that there should be so many "human pianofortes out of tune in the world." Büchner's own Materialism is outspoken, as may be judged from the following propositions:—
1. Spirit without Body is unimaginable.
2. The Soul brings with it "no innate intuitions"; and
3. It is not an ens per se, but a product of external influences.
4. There is no individual immortality nor personal continuance after death.