aut tamquam sagitta emissa in locum destinatum, divisus aër continuo in se reclusus est, ut ignoretur transitus illius:
Or as when an arrow is shot at a mark, the divided air quickly cometh together again, so that the passage thereof is not known:
Aut sicut sagitta emitte in loco destinatum, divide aëra continuo in se reclude es, ut transitu ignora de illo: