Sir _John
Heydon_, the Lieutenant of his Majesties Ordnance (that generous
and knowing gentleman and consummate souldier, both in theory
and practice) was the first that instructed me how to do this,
by means of a furnace, so made as to imitate the warmth of a
sitting hen. In which you may lay several eggs to hatch and by
breaking them at several ages, you may distinctly observe every
hourly mutation in them, if you please. The first will be, that
on one side you shall find a great resplendent clearness in the
white. After a while, a little spot of red matter, like blood
will appear in the midst of that clearness, fast'ned to the
yolk, which will have a motion of opening and shutting, so as
sometimes you will see it, and straight again it will vanish
from your sight, and indeed, at first it is so little that you
cannot see it, but by the motion of it; for at every pulse, as
it opens you may see it, and immediately again it shuts, in such
sort as it is not to be discerned. From this red speck, after a
while, there will stream out a number of little (almost
imperceptible) red veins. At the end of some of which, in time,
there will be gathered together a knot of matter, which by
little and little will take the form of a head and you will, ere
long, begin to discern eyes and a beak in it.
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