( H7 ) 
Fits of eafy Tranfmifrion and Refledion, fuccecding 
each other at equal Intervals ; infomuch that if they 
reach the further Superficies in one fort of thole Fits, 
they lhall be tranfmitted ; if in the other kind of 
them, they lhall rather be refle(!^ed back. Whence 
the Rays that proceed from B to C, and emerge in the 
Line CD, being in a Fit of eafy Tranfmifiion, the feat- 
tered Rays that fall at a Imall Dillance without thele 
on either fide, (fuppole the Rays, that pafs in the 
Lines B E? B G) lliall fall on the Surface in a Fit of ealy 
Refledfion, and lhall not emerge ; but the fcattered 
Rays, that pafs at fome Dillance without thefe lall, lliall 
arrive at the Surface of the Drop in a fit of eafy Tranfi 
million, and break through that Surface Suppole 
thele Rays to pafs in the Lines B F, B FI ; the former 
of which Rays lliall have had one Fit more of eafy 
Tranfmillion, and the latter one Fit lels, than the 
Rays that pals from B to C. Now both thele Rays, 
when they go out of the Drop, will proceed by the 
Refradlion of the Water in the Lines FI, FiK, that 
will be inclined almoll equally to the Rays incident 
on the Drop, that come from the Sun, but the Angles 
of their Inclination will be lefs than the Angle, in 
which the Rays emerging in the Line CD are inclined 
to thofe incident Rays. And after the fame manner 
Rays fcattered from the Point B, at a certain Dillance 
without thefe, will emerge out of the Drop, while the 
intermediate Rays are intercepted ; and thele emergent 
Rays will be inclined to the Rays incident on the' 
Drop in Angles Hill lels than the Angles, in which the 
Rays F I and H K are inclined to them ; and without 
thefe Rays will emerge other Rays, that fliall be in- 
clined to the incident Rays in Angles yet lels. - Now 
by this means will be formed of every kind of Rays, 
befides the principal Arch which goes to the Forma- 
R i tion 
