The name Emanuel is found in other alchemical writings. The _De Perfecto Magisterio_, for example, which has been reprinted by Zetzner, embodies another work, the _Liber duodecim aquarum_ which is expressly said to be taken from the ‘Liber Emanuelis.’ Pursuing the matter further still, we come to the _Liber Aristotelis_ which commences, ‘Cum de sublimiori atque precipuo.’ The author of this treatise, we find, claims not only the _Liber duodecim aquarum_ (‘quae qualiter se habeant in libro quem XII. aquarum vocabulo descripsimus, prudens lector intelligere poterit’), but also, it would seem, the very one of which we are in search (‘in libro secretorum a nobis dictum est’). Everything inclines us to the belief that we here touch the source from which the main part of the _Liber Luminis_ was drawn, and this conclusion is not a little strengthened when we observe that the treatise ‘Cum de sublimiori’ is called the _Lumen Luminum_ in the Riccardian copy.[134] The _Secreta_, however, was not the only source from which the _Liber Luminis_ and the _Liber Dedali_ were drawn, and the assertion of the preface that the former was composed of extracts from many different philosophers is fully borne out when we examine the substance of the books themselves. A strain of Greek influence is to be traced, for example, in the names of Archelaus, Dedalus, Plato, and Hermes, as well as in the use of _ciatus_ as an equivalent for the word ‘cup,’ and this reminds us strongly of the _Summula_ with its reference to the Emperor Manuel. It is not impossible that Scot may have borrowed much from the Byzantine chemists of the twelfth century. With this notion agrees the passage of the _Liber Dedali_ where Saracens are spoken of as foreigners. On the other hand, much had evidently been taken from Arabic sources, as is plain from the names given to several of the vessels used in alchemy, such as the _alembic_ and _aludel_. Indeed, Unay and Melchia, who are quoted in the _Liber Luminis_, must have been Moors, for the corresponding passage of the _Liber Dedali_ describes them as from ‘Lamacha of the Saracens.’ Both these texts agree in showing such familiarity with the process of refining sulphur that one is led to suppose the _Secreta_, their common original, may have been composed in Sicily. The _Liber Luminis_ says of one of the alums that it is ‘brought from Spain:’ an expression agreeing well with the notion of a Sicilian author, who would naturally speak of Spain as a foreign land.