Book, Paragraph

 1   I,  3 | distinctions already drawn and then explain the "milky way" and comets
 2   I,  3 |   intermediate space.~It remains to explain, after a preliminary discussion
 3   I,  3 |           of space and are lost. To explain this we must suppose either
 4   I,  3 |         state of change.~So much to explain why clouds are not formed
 5   I,  3 |            of sense, but we may now explain how it can be produced by
 6   I,  4 |             these principles let us explain the cause of the appearance
 7   I,  6 |                   6~Let us go on to explain the nature of comets and
 8   I,  6 |           causes brought forward to explain comets are false.~
 9   I,  7 |            As for the halo we shall explain its cause later.~The fact
10   I,  8 |                        8~Let us now explain the origin, cause, and nature
11   I,  8 |      fundamental principle and then explain our views. We have already
12   I,  8 |             follows the sun, and we explain the halo as a reflection
13   I,  13|                           13~Let us explain the nature of winds, and
14  II,  1 |                            1~LET us explain the nature of the sea and
15  II,  1 |           sources of the sea and to explain its observed flow.~
16  II,  2 |          and not of the sea, and to explain why sweet water is only
17  II,  3 |                       3~We must now explain why the sea is salt, and
18  II,  3 |             whole world in order to explain these facts. But we have
19  II,  3 |            seem unsuccessful let us explain it by the help of the principle
20  II,  3 |             we must go on to try to explain why the sea is salt. There
21  II,  6 |                        6~Let us now explain the position of the winds,
22  II,  9 |                   9~Let us go on to explain lightning and thunder, and
23 III,  1 |                            1~LET us explain the remaining operations
24 III,  2 |                        2~Let us now explain the nature and cause of
25 III,  2 |         things for granted while we explain others.~
26 III,  4 |          reflection: we have now to explain what sort of reflection
27  IV,  8 |            another. Let us go on to explain the nature of each of them.