He discovered the actual transmutations in direct genetic series of species on the successive deposition levels of the old lake basin.
In order to refer back to the Physics, the De Coelo, and the De Generatione, this work begins by stating that the first causes of all nature and all natural motion, the stars ordered according to celestial motion and the bodily elements with their transmutations, and generation and corruption have all been discussed; and by adding that there remains to complete this investigation, what previous investigators called meteorology.
" Yet seeming transmutations of Colours may be made, where there is any mixture of divers sorts of Rays.
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