Opticks 1717 - Up

them 3 cover’d it a cleay GM?, and by that
rncans its Colours emerged in a very regular
tirdet, like fo many concentrick &ings encompaffing
the top of the Bubble. And as theBubble
grew thinner by the continual frtbfiding of
the Water, thefe Kings dilated ffowly and overfpread
the whole Bubble, defcending in order
to tile bottom of it, where they vaniih’d fixcefflvely.
In the mean while, after all the Colouts
were emerged at the top, there grew in
the center of the Rings a fmall round black
Spot, like that in the firit: Oblervation , which
continuaIly dilated it feIf till it became fometimes
more than ; or 4 of an Inch in breadth
before the Eubble broke. At firit: I thougllt
there had been no Eight: reA&ed from the N a-:
ter in that pIace, but obierving it more curioufly
, I faw within it feveral fmaller round
Spots9 which appeared much blacker and darkel-
than the rei1, whereby X knew that there
was fame Reflexion at the ‘other places which
were not i‘o dark as thofe Spots. And by farther
Tryal I found that I could fee the Images
of fame things (as of n Candle.or the Sun) ve-+
ry faintly reflekted 9 not only from the great
black Spot, but alfo from the little darker Spots
~vhich were within it.
’ Befides the aforefaid colour’d Rings there
would often appear fmall Spots of Colours, afoending
and defcending up and down the fides
of the Bubble, by reafon of fame Inequalities
in the fubfiding of the,Water. And fometimes
final1 black Spots generated at the iides ;;e;ii