( 6iz ) 
•near, but not in ContaCt, or at lead not near enough 
to bring down the green, blue, purple and violet 
Rays. This ihews that the Reflection is not made 
from the interior folid Parts of the Glafs, nor from 
the Parts in the Surface, as Rizzetti affirms. But this 
is made more evident by 
Experiment VIII. Fig. 17. 
A Candle being in the Pofition K, the Eye at E, 
and the Prifm at ABC; a ftrong Image of the Can- 
dle was feen at k as in Fig. 7. But lifting up a Veflei 
of Water VSS V till the Surface of the Water V V 
touched A B the lower Surface of the Prifm, the I- 
mage of the Candle became almoft infenflble, as the 
Eye loll all thofe Rays which now were attracted in- 
to the Water. And for a farther Proof, that the Re- 
flection is made under the Surface and not in it, 
when the Prifm was taken out of the Water, being 
wet at its lower Surface, or having a Stratum of 
Water ( whofe Surface was VV Fig. 18) under 
A B, the Image of the Candle did again become vivid, 
the Rays being turned up again under V V. Indeed 
the Image, in this Cafe, though ftrong, did not ap- 
pear well defined, by Reafon of the Unevennefs of 
the watry Surface VV Fig. 18. 
I am very well aware that Rizzetti may anfwer 
here, that what I have faid above, does in fome Mea- 
fure favour his Notions; and that the Rays which (in 
Fig . 7, having pafled through AB, the lower Surface 
of the Priim) are turned up again to the Eye at E, 
do not luffcr a Reflection but a new Immerflon ; for 
.he .fays, in Tage 115. ‘ e Anglus (meaning Sir 
“ Ifaac 
