ew'd together, are agreeable to one another, as those of Gold
and Indigo, and others disagree.

_Qu._ 15. Are not the Species of Objects seen with both Eyes united
where the optick Nerves meet before they come into the Brain, the Fibres
on the right side of both Nerves uniting there, and after union going
thence into the Brain in the Nerve which is on the right side of the
Head, and the Fibres on the left side of both Nerves uniting in the same
place, and after union going into the Brain in the Nerve which is on the
left side of the Head, and these two Nerves meeting in the Brain in such
a manner that their Fibres make but one entire Species or Picture, half
of which on the right side of the Sensorium comes from the right side of
both Eyes through the right side of both optick Nerves to the place
where the Nerves meet, and from thence on the right side of the Head
into the Brain, and the other half on the left side of the Sensorium
comes in like manner from the left side of both Eyes. For the optick
Nerves of such Animals as look the same way with both Eyes (as of Men,
Dogs, Sheep, Oxen, &c.) meet before they come into the Brain, but the
optick Nerves of such Animals as do not look the same way with both Eyes
(as of Fishes, and of the Chameleon,) do not meet, if I am rightly
inform'd.

_Qu._ 16. When a Man in the dark presses either corner of his Eye with
his Finger, and turns his Eye away from his Finger, he will see a Circle
of Colours like those in the Feather of a Peacock's Tail. If the Eye and
the Finger remain quiet these Colours vanish in a second Minute of Time,
but if the Finger be moved with a quavering Motion they appear again. Do
not these Colours arise from such Motions excited in the bottom of the
Eye by the Pressure and Motion of the Finger, as, at other times are
excited there by Light for causing Vision? And do not the Motions once
excited continue about a Second of Time before they cease? And when a
Man by a stroke upon his Eye sees a flash of Light, are not the like
Motions excited in the _Retina_ by the stroke? And when a Coal of Fire
moved nimbly in the circumference of a Circle, makes the whole
circumference appear like a Circle of Fire; is it not because the
Motions excited in the bottom of the Eye by the Rays of Light are of a
lasting nature, and continue till the Coal of Fire in going round
returns to its former place? And considering the lastingness of the
Motions excited in the bottom of the