he Water.
And sometimes small black Spots generated at the sides would ascend up
to the larger black Spot at the top of the Bubble, and unite with it.

_Obs._ 18. Because the Colours of these Bubbles were more extended and
lively than those of the Air thinn'd between two Glasses, and so more
easy to be distinguish'd, I shall here give you a farther description of
their order, as they were observ'd in viewing them by Reflexion of the
Skies when of a white Colour, whilst a black substance was placed
behind the Bubble. And they were these, red, blue; red, blue; red, blue;
red, green; red, yellow, green, blue, purple; red, yellow, green, blue,
violet; red, yellow, white, blue, black.

The three first Successions of red and blue were very dilute and dirty,
especially the first, where the red seem'd in a manner to be white.
Among these there was scarce any other Colour sensible besides red and
blue, only the blues (and principally the second blue) inclined a little
to green.

The fourth red was also dilute and dirty, but not so much as the former
three; after that succeeded little or no yellow, but a copious green,
which at first inclined a little to yellow, and then became a pretty
brisk and good willow green, and afterwards changed to a bluish Colour;
but there succeeded neither blue nor violet.

The fifth red at first inclined very much to purple, and afterwards
became more bright and brisk, but yet not very pure. This was succeeded
with a very bright and intense yellow, which was but little in quantity,
and soon chang'd to green: But that green was copious and something more
pure, deep and lively, than the former green. After that follow'd an
excellent blue of a bright Sky-colour, and then a purple, which was less
in quantity than the blue, and much inclined to red.

The sixth red was at first of a very fair and lively scarlet, and soon
after of a brighter Colour, being very pure and brisk, and the best of
all the reds. Then after a lively orange follow'd an intense bright and
copious yellow, which was also the best of all the yellows, and this
changed first to a greenish yellow, and then to a greenish blue; but the
green between the yellow and the blue, was very little and dilute,
seeming rather a greenish white than a green. The blue which succeeded
became very good, and of a very bright Sky-colour, but yet something
inferior to the former blue; and the violet was intense and deep with
little or no redness in it. A