Volucres minus habent terreni, minus umoris, caloris temperate, aeris multum: igitur levioribus principiis conpositae facilius in aeris impetum nituntur.
Birds have less of the earthy, less of moisture, moderate heat, much air. Therefore being compounded of the lighter principles, they rise more easily against the onrush of the air.
final_alignments\Vitruvius_Architecture_Book_1.json