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contrast, an eclipse of the sun or moon arises. Now, however, the art undertakes to discover these motus motions and movements, and when it finds them to be true, it can then know the exact time of such an eclipse. From this, then, after such eclipses are all predetermined and announced, we recognize that the motus coelestes celestial motions, which harmonize with nature, can also be discovered by art. Likewise, when the art discovers the specific materi matter and form of silver and gold, together with the efficiente efficient cause, and knows how to combine these causes (as the philosophi philosophers testify), they can also produce the true, natural opus Great Work and gold. Because this has happened among many skilled artists, it is to be concluded infallibly that the considerations of the arts harmonize with the work of nature. It would indeed be desirable if this were also the case with medicine and the other arts (for as far as the meras scientias pure sciences are concerned, there is no doubt of this); then the principia principles would harmonize with their fine end/purpose, and the effect effect/result with its causes, which, as has been observed by many, happens only very rarely.