[31]See Bk. IV., Chapters XIV. and XV.

[32] See Bk. I., Ch. III.

[33] See Bk. I., Ch. XX.

[34] See Bk. I., Ch. XXV.

[35] See Bk. I., Chap. III.

[36] See Book V., Ch. XI.

[37] See Book V., Chapters XIV., XV., and XVI.

[38] See Chap. V.

[39] See Bk. III., Chaps. XIX., XXI., XXIV., XXV., XXVI., XXVII. and XXVIII.

[40] I am speaking of the difference between positive quantities; for with regard to other quantities we may express an infinite difference algebraically. Let the two quantities be (∞ - a) and (-a). The difference between them will be expressed in this equation, D=(∞ - a) - (-a) = ∞ - a + a = ∞.