White first tells us that, if you have one, you can look into a piece of Arabian selenite (‘within the bodie of this Stone the Moon sheweth her selfe’).

“Our common house Cats also have this propertie by the subjection that the Moone hath over them; that their Eie-browes doe increase, or decrease each day, according to the course of the Moone and her aspects; which thing is dailie seene to him that pleaseth to note the experience thereof.”