xv, 4 (in Migne, cxcii, 682); for St.Thomas Aquinas as to the laws of Nature, see Summae Theologica, i, Quaest.

lxvii, art.

iv; for his discussion on Avicenna's theory of the origin of animals, see ibid., i Quaest.

lxxi, vol.i, pp.

1184 and 1185, of Migne's edit.; for his idea as to the word of God being the active producing principle, see ibid., i, Quaest.