heats, in imitation of the Sun's and heavenly bodies' heats, that pass
divers inequalities, and (as it were) orbs, progresses, and returns,
whereby we produce admirable effects. Besides, we have heats of dungs;
and of bellies and maws of living creatures, and of their bloods and
bodies; and of hays and herbs laid up moist; of lime unquenched; and
such like. Instruments also which generate heat only by motion. And
farther, places for strong insulations; and again, places under the
earth, which by nature, or art, yield heat. These divers heats we use,
as the nature of the operation, which we intend, requireth.

"We have also perspective-houses, where we make demonstrations of all
lights and radiations; and of all colours: and out of things
uncoloured and transparent, we can represent unto you all several
colours; not in rain-bows, (as it is in gems, and prisms,) but of
themselves single. We represent also all multiplications of light,
which we carry to great distance, and make so sharp as to discern
small points and lines. Also all colourations of light; all delusions
and deceits of the sight, in figures, magnitudes, motions, colours all
demonstrations of shadows. We find also divers means, yet unknown to
you, of producing of light originally from divers bodies. We procure
means of seeing objects afar off; as in the heaven and remote places;
and represent things near as afar off; and things afar off as near;
making feigned distances. We have also helps for the sight, far above
spectacles and glasses in use. We have also glasses and means to see
small and minute bodies perfectly and distinctly; as the shapes and
colours of small flies and worms, grains and flaws in gems, which
cannot otherwise be seen, observations in urine and blood not
otherwise to be seen. We make artificial rain-bows, halo's, and
circles about light. We represent also all manner of reflexions,
refractions, and multiplications of visual beams of objects.