Book,  Paragraph

 1   I,  6|    so but simply because of necessity, and secondly because it
 2  II,  1|   that the sexes arise from Necessity and the first efficient
 3  II,  6|   use of both; they have of necessity the power of bringing about
 4  II,  6|  thus it is in one sense by necessity, in another for a final
 5  II,  6|   be formed in one sense of necessity, but in another sense not
 6  II,  6|     in another sense not of necessity but for a final cause.~The
 7  II,  6|    fluid except the eye. Of necessity therefore this region is
 8  II,  8|  sterile, but will be so of necessity.~We find also that the bodies
 9 III,  4| them. The eggs then grow of necessity through this cause (for
10  IV,  3| this, however, is a natural necessity. (For the class of animals
11  IV,  8| what remains must become of necessity bitter and ill-flavoured.
12  IV,  8| sake of what is best and of necessity.~It is here, then, that
13   V,  1|   things come into being by Necessity. For, as was said originally
14   V,  1|     the animal must have of necessity (for the fundamental idea
15   V,  1|     of a particular kind of necessity in another sense, not the
16   V,  8|  wearing down), partly from necessity because, while the roots
17   V,  8|     final cause, reduces to necessity all the operations of Nature.
18   V,  8|     Nature. But to say that necessity is the only cause is much
19   V,  8|    for any final end but of necessity and on account of the motive