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ROS1CRUCIAN APOLOGISTS: JOHN HEYDON. 381
of their bloods and bodies, of hayes and herbs layed up
moist, of brine unquenched,
and such like instruments
also which generate heat only by motion, places for strong
insolations, places under the earth which by
nature or art
yeeld heat.
" We have also perspective-houses where we make demon-
strations of all lights and radiations, and of all colours ;
out
of things uncoloured and transparent we can represent unto
you severall colours, not in rain-bows, as it is in gemms and
prismes, but of themselves single. We respect also all mul-
tiplications of light, which we carry to great distances, and
make so sharpe as to discern small points and lines, all
colourations of light, all delusions and deceits of the sight
in figures, magnitudes, motions, colours, all demonstrations
of shadows. We finde also divers means, yet unknown to
you, of producing light originally from divers bodies. We
procure means of seeing bodies afar off, as in the heaven, and
represent things near as farr off, and things afarr off as
near. We have also helps for the sight farr above spec-
tacles and glasses, and means to see minute bodies dis-
tinctly, as the shapes and colour of small flies and wormes,
observation in urine and bloods. We make artificial Rain-
bowes, halos, and circles about light. We represent also
all manner of reflections, refractions, and multiplications of
visuall beams of objects.
" We have also pretious stones of all kinds, many of great
beauty, and to you unknown, crystals likewise and glasses
of divers kinds, amongst them some of mettals vitrificated,
and other materials besides those of which you make glasse ;
also a number of fossiles and imperfect minerals which you
have not, likewise loadstones of prodigious vertue, and other
rare stones, both naturall and artificial!. We have sound-