Sidgwick, Professor Henry, 29, 31. Sinigaglia, 225. Sixtus V., Pope, condemnation of _trinus contractus_, 211. Slater, Father, 109, 128, 129, 130. Slavery, analogy with property, 97. attitude of Christianity to, 88. limits of master's rights, 100. three kinds of, 99. views of Christian Church and philosophers reconciled by Aquinas, 93 _et seq._ Smith, Adam, 29. _Societas_, 206, 207, 210, 213. Socialism, as providing an ethical basis of society, 31. danger of, 32. relation of its economic teaching to Christianity, 33. Socialists, claim to authority of the early Christians, 49 _et seq._ attempts to construct Utopia, 228. their communism not the 'community of user' advocated by scholastics, 86. their interpretations of St. Augustine, 58. their main principles, 230. their philosophy at variance with Christianity, 231. their principles not derived from mediæval teaching, 230. their view of the Church's teaching on usury, 198. _Socius stans_, 207. Solon, laws of, as affecting usury, 160. _Songe du Vergier_, 225. Stagyrite, the, _see_ Aristotle. Stoic tradition, the, 58. Stoicism, inferiority to Christian teaching on slavery, 89. Stoics, the, 93. Stintzing, 20. Sudre, 47, 48. _Summa Angelica_, 186. _Astesana_, 186. _Pisana_, 156. Superabundance, relativity of, 75. 'Teaching,' interpretation of, 3, 19 _et seq._ mediæval, its relation to practice, 21. ethical nature of, 27. Temperance, in the use of goods, 70. Tertullian, 45, 49, 145, 168, 170. _Thessalonians, Epistle to the_, 137. Thirteenth century, progress made in the, 15. Thomas Aquinas, 7, 16, 17, 18, 19, 20, 36, 41, 42, 46, 52, 62 _et seq._, 67, 69, 70, 71 _et seq._, 74 _et seq._, 77, 78, 80, 81, 82, 83, 84, 85, 91, 93, 94, 95, 96, 97, 99, 101, 105, 111, 112, 114, 117, 119, 121, 131, 132, 133, 135, 136, 141, 143, 144, 146, 147, 148, 149, 150, 151, 154, 156, 162, 167, 173, 174, 176, 182, 186, 188, 189, 193, 194, 195, 197, 206, 207, 208, 215, 230. Ticinum, Synod of, decree on usury, 173. Tillage, _see_ Agriculture. Time, the sale of, 182. _Timothy_, 151. _Titulus_, distinction from _fundamentum_, 64. _Tractatus Universi Juris_, 19. Tradesman, _see_ Commerce. Trade, _see_ Commerce. Troplong, 226. _Trinus contractus_, 210, 211. Trithemius, 85, 124, 137, 149. Twelve Tables, the, maximum rate of interest fixed by, 160.