Book, Paragraph

 1      I,  1 |       each of these latter make use of old knowledge to impart
 2      I,  1 |  principle the same, since they use either example, a kind of
 3      I,  10|    sense of analogous, being of use only in so far as they fall
 4      I,  11|        demonstrator, who cannot use the opposite facts to prove
 5      I,  21|        series terminates. If we use the third figure, we shall
 6      I,  26|         is the better known, we use reductio ad impossible;
 7      I,  26|         is the more obvious, we use direct demonstration. All
 8     II,  7 |         of defining actually in use, that definition does not
 9     II,  13| essential nature they may be of use we will proceed to show.
10     II,  13|        indeed, seem to be of no use at all, but rather to assume