Thus he says that the silver which has been changed into gold by the projection of the red elixir is not rendered resistant to the agents which affect silver but not gold, and Albertus Magnus in his De Mineralibus - the De Alchemia attributed to him is spurious - states that alchemy cannot change species but merely imitates them - for instance, colours a metal white to make it resemble silver or yellow to give it the appearance of gold.
In the former he imitates the Greek poet Archilochus, but takes his subjects from the men, women and incidents of the day.
3 Fleming and Ashton, " On a Model which imitates the behaviour of Dielectrics," Phil.
It imitates the motions made in polishing a speculum by hand by giving both a rectilinear and a lateral motion to the polisher, while the speculum revolves slowly; by shifting two eccentric pins the course of the polisher can be varied at will from a straight line to an ellipse of very small eccentricity, and a true parabolic figure can thus be obtained.
In his survey of the " liberal arts " St Augustine imitates (as we have seen) the Disciplinae of Varro, and in the greatest of his works, the De Civitate Dei (426), he has preserved large portions of the Antiquitates of Varro and the De Republica of Cicero.
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