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Ptolemaeus Arabus et Latinus

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Work C.3.5

Andalo di Negro
De infusione spermatis


‘(ed. Thorndike) Tractatus de infusione spermatis secundum dominum Andelonem de Nigro de Ianua. Super verbo Centiloquii 51. Hester etiam Ptholomeus et Hermes dixerunt quod locus seu gradus signi in quo est Luna tempore infusionis spermatis est gradus ascendens in nativitate et quod gradus qui est ascendens in infusione spermatis, in dicto gradu illius signi erit Luna in tempore nativitatis. Dixerunt etiam Ptholomeus et Hermes quod cum Luna tempore infusionis spermatis est in ascendente, tunc mora nati in ventre matris est spatium 273 dierum et hec dicitur mora media… Ester Catayus habuit aliquam differentiam a Ptholomeo et Hermete… Sed Ptholomeus et Hermes dixerunt quod mora maior superabat mediam per dies 15… Dixerunt etiam quod planete qui dominabantur a conception usque ad nativitatem… Dixit Ester quod in omni conception necessaria sunt yles et alcocodeus acatzir — sicut quando aliquis planeta est alcocodeus mutatur mora ut capitulo alcocodei more dicitur.’


A commentary on v. 51 of the Centiloquium and on Pseudo-Ptolemy’s Dixerunt Ptolomeus et Hermes quod locus Lune… (B.10), reporting also the opinion of one ‘Hester’, ‘Ester’ or ‘Ester Catayus’.


Written by Andalo di Negro (c. 1260-1334), whose name is given in all three known MSS.


L. Thorndike, A History of Magic and Experimental Science, III, New York, 1934, 193-194; L. Thorndike, ‘Notes upon Some Medieval Latin Astronomical, Astrological and Mathematical Manuscripts at the Vatican’, Isis 47 (1956), 391-404: 395-397; J.-P. Boudet, ‘Naissance et conception: autour de la proposition 51 du Centiloquium attribué à Ptolémée’, in De l’homme, de la nature et du monde. Mélanges d’histoire des sciences médiévales offerts à Danielle Jacquart, Genève, 2019, 165-178: 176.


Thorndike, ‘Notes upon…’, 395-397 (from the three MSS).