[329] The manuscript shows a drawing of a magic circle here. It has the names of demons alternately with those of the cardinal points. [330] These are names of philosophers probably the same as the ‘vnay et melchia’ of the _Luminis Luminum_, the rather that the phrase ‘non convertitur perfecte in lunam’ occurs in both passages. I do not know how to explain the fact that two paragraphs of the _Liber Dedali_ correspond so closely with one in the _Liber Luminis_. [331] There is probably a reference here to the disputes which divided the different alchemical schools. [332] The nature of this powder of moles is explained a little further on in the Liber Dedali, par. 10. [333] A double chloride of ammonium and mercury, represented by the formula _2NH₄Cl. HgCl₂, H₂O_. [334] The use of matters derived from the animal kingdom, carbonised toads or moles, may be illustrated from the Liber Dyabesi (Ricc. ms. l. iii. 13, 119, p. 4 recto) which treats of what had been ‘ab omni Latinitate intemptatum’ viz. the distillation of a white land-tortoise (v. p. 7 verso). Pliny remarks that goat’s blood sharpens and hardens iron tools and polishes steel better than any file. [335] This passage is highly significant, and furnishes a key to the title of the treatise. [336] The doctrine of the vitriols is here substantially the same as in the great work of Ibn Beithar of Malaga. [337] There is a well-known tract _De aluminibus et salibus_ ascribed to Rases in the Paris MS. (6514 p. 128); it also occurs in the Speciale MS. [338] This phrase is found in the _De aluminibus et salibus_ of Rases (Paris ms. 6514 p. 128) who calls the place ‘Elebla.’ Vincent of Beauvais ascribes the saying to Geber. [339] The use of the first person singular here agrees with the notion that in this part of the _Liber Luminis_ we have the record of the author’s own experiments. See _ante_, p. 87. INDEX _Abbreviatio Avicennae_, 53-59, 66, 152, 177, 178. Abd-el-Mumen, 112. Aboasar, 101, 143. Abraxas gems, 132. Abrincensis, Henry, 164, 176. Achinas, 31. Alain de l’Isle, 195. Alamout, Castle of, 147. Albategni, 100. Albertus Magnus, 78, 127, 143, 185. Albigenses, 109, 111. Albigensian Crusade, 111, 112, 193. Alchemy, 65-95. ⸺ Disputes concerning, 73, 259. Alexander the Great, 32, 33. ⸺ Legend of, 187-189. Alexandria, 32, 69. Alfarabi, 129. Al Faquir, 49, 118. Alfargan, 101. Algebra and Magic, 100, 190-192. Al Khowaresmi, 100. Al Kindi, 71, 73, 74, 79. _Almagest_, 98. Al Mamun, 100. Al Mansour, 112. Almuchabola, 190, 192, 270. Alpetrongi, 99-105, 124. Alphagirus or Al Faquir, 49, 118. Alphonso of Castile, 112, 143. Ambassador, Scot as an, 169-175, 218. Andrew, Scot’s interpreter, 119. Anonymous Florentine, The, 8, 210, 211. _Apologie des Grands Hommes_, 222. Aquinas, S. Thomas, 204.