For that
_Globule_ is not carry'd to the eye according to his formerly recited
Principle; and if not so, I cannot conceive how it can communicate its
_rotation_, or circular motion to the line of the _Globules_ between the
drop and the eye. It cannot be by means of every ones turning the next
before him; for if so, then onely all the _Globules_ that are in the odd
places must be turned the same way with the first, namely, the 3. 5. 7. 9.
11, &c. but all the _Globules_ interposited between them in the even
places; namely, the 2. 4. 6. 8. 10. &c. must be the quite contrary, whence,
according to the _Cartesian Hypothesis_, there must be no distinct colour
generated, but a confusion. Next, since the _Cartesian Globuli_ are
suppos'd (_Principiorum Philosoph._ Part. 3. Sec. 86.) to be each of them
continually in motion about their centers, I cannot conceive how the eye is
able to distinguish this new generated motion from their former inherent
one, if I may so call that other wherewith they are mov'd or _turbinated_,
from some other cause than refraction. And thirdly, I cannot conceive how
these motions should not happen sometimes to oppose each other, and then,
in stead of a _rotation_, there would be nothing but a direct motion
generated, and consequently no colour. And fourthly, I cannot conceive, how
by the _Cartesian Hypothesis_ it is possible to give any plausible reason
of the nature of the Colours generated in the thin _laminae_ of these our
_Microscopical Observations_; for in many of these, the refracting and
reflecting surfaces are parallel to each other, and consequently no
_rotation_ can be generated, nor is there any necessity of a shadow or
termination of the bright Rays, such as is suppos'd (_Chap.
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