Book, Paragraph

 1      I,  5 |           it might be supposed that lines thus perpendicular were
 2      I,  5 | demonstrated separately of numbers, lines, solids, and durations,
 3      I,  5 |          possess this attribute qua lines or qua numbers, but qua
 4      I,  7 |      Geometry again cannot prove of lines any property which they
 5      I,  7 |             they do not possess qua lines, i.e. in virtue of the fundamental
 6      I,  7 |            is the most beautiful of lines or the contrary of the circle;
 7      I,  7 |          qualities do not belong to lines in virtue of their peculiar
 8      I,  10|              in geometry points and lines. Both the existence and
 9      I,  10|            deflection or verging of lines, whereas the existence of
10     II,  17|             The cause when they are lines, and when they are numbers,
11     II,  17|              different in so far as lines are lines and not numbers,
12     II,  17|    different in so far as lines are lines and not numbers, identical