Note 2600 — Chapter XXVIII · ARABIC OCCULT SCIENCE OF THE NINTH CENTURY

In Digby 91 Roger Bacon on Perspective is followed by Alkindi on the rays of the stars, while in Digby 183 a marginal note to Alkindi’s treatise reads “Nota hoc quod est extractum de libro Rogeri Bakun de celo et mundo, capitulo de numero celorum,” and following the work of Alkindi we have Bacon on the retardation of old age and perhaps also de radiis solaribus.