14, in Migne, xxxiv, 188,--lib.
v, cap.

5 and cap.

23,--and lib vii, cap I; for the citations from his work on the Trinity, see his De Trinitate, lib.

iii, cap.

8 and 9, in Migne, xlii, 877, 878; for the general subject very fully and adequately presented, see Osborn, From the Greeks to Darwin, New York, 1894, chaps.
ii and iii.
This idea of a development by secondary causes apart from the original creation was helped in its growth by a theological exigency.