( ) 
Eiperiment V* 
Touchwg the Vrodi0ion of Light npn the At^rHiou of " 
on Glafs under Waten 
This Experiment was nothing more than a Repetition 
of the laft, faving only the Included Apphatus was entire- 
ly cover'd with Water : From the forface of which v/hen 
the Air came to be withdrawn, and the great Wheel turn d 
as ufual, 'twas eafie to difcover a pretty (mart Light, 
upon the firft motion of the Included Glafs Globe on the 
Tubes, illuminating the whole body of the Liquid. The 
parts of the Tubes where the fridion was made by the 
Globe were diftinguiihably Red ^ but foon leffen'd in their 
Appearance, and in no long time extingui(h*d. The Wa^ 
ter ( by the Continuance of the Motion ) approaching near- 
er and nearer to the Colour of Whey ^ and at laft became 
fo thick, by the Grit or Powder produced by the Attrition 
of the Glaffes, that the Light could then be but juft dif- 
cover'd thro the Body of it, and that not conftantly, hat 
like faint flafhes at diftances. This Experiment I have 
made, when it has fucceeded to appear more Luminous 
than at this tryal. I have obferv*d the Duft ( produced 
from the GlalTes upon their Attrition) thro a good Mi- 
crofcope, but could not learn by my greateft attention that 
the parts were any ways melced 3 they appeared of a long 
and flender figure. 
liiiiiiiiiiii 2 
IV. Pm 
