I need a quotation from Dirichlet's lectures on number theory edited by Dedekind. The first two editions seem to be available online, but the 4th edition from 1893 is not. In it, Dedekind says on p. 193 something like
"In his lectures, Dirichlet always used the word 'forma anceps', which I have kept when I prepared the first edition (1863); in the second and third editions (1871, 1879) [...] I called them 'ambiguous forms' following Kummer, who used this notation in a related field."
Could some kind soul provide me with the German original?