John Weeks Moore, Complete Encyclopaedia of Music… (1880)
“ We should not wonder at this ignorance, when we find people in our own time asserting the existence of quarter tones, &c., in our subdivision of the octave, seeing that it can be plainly proved we cannot, for practical utility, adopt any other system than twelve semitones in the said octave. Hence the best writers use D# and E b indiscriminately, just as the doigt� of the respective instruments requires for the sake of facility. Nobody will doubt that Mozart, Weber, Spohr, &c., are musicians ”
