Chapter Xii.--Same Sources As for Ch. I. and Also Vi. 105-6; V. 524-5.

Chapter XIII.--Opp. v. 60; iii. 249; v. 157, 167-70, 108; iii. 251-61; iv. 17, 253; v. 103, 217-18, 562; Scritti inediti, p. 9.

Chapter XIV.--Opp. v. 94-6, 58, 79, 321, 63-4, 84-5, 96, 93, 100; iv. 27-8, 29-30, 97, 169, 200, 271; v. 182-3, 61-4; iii. 230; iv. 236-43, 184; iii. 450-59; v. 113, 115, 149, 211, 59, 74, 100, 183; iv. 75-6, 89; v. 206; iv. 99; iii. 273; v. 260; iii. 280; v. 430-31, 202-3, 98-9.