( io6p ) 
withmj but that the fame caufej which produceth them in the 
round grains , could alfo produce them in Cylinders: Which 
being fuppofed to be fuch as the IV. Figure repiefents them , 
viz, oblong icy grains 5 and roundifli at both ends , having 
the inner kernel of the ftme fliape, it was found , that k om 
their diferent difpofidons all the appearances of tliQ P^rhelid 
and their C/r^r/^/ did neceflarily follow. 
And fir/^ that fome of thefe Cylinders being ereil, in the 
fituation which probably they ought to have in being formed ^ 
there muft appear in the Heavens a great white Circle, parallel 
to theHorlfon, pafling through the Sun, and of near the 
fame breadth with him^ as hath been obferved in the Phdm- 
menoHoi Rme A. i^ip. of which Gaffendm and Des Cartes 
have written, and which is here exhibited in the V. Figure. 
That this Circle L K N M is caufed by the refleiflion of the 
rays of the Sun upon the furfaceof thefe Cylinders % it being 
eafy todemonftrate 5 that there are none but thofe, which are 
raifcd at the fame angle above the Horizon with that of the 
height of the Sun,that can refle<5l: his rays to our Eye. Whence 
it manifeftly follows, that it muft appear White, and through- 
out of equal altitude with the Sun itfelf , and by confequence 
' parallel to the Horizon. That confidering afterwards the Tranf- 
parency of thefe perpendicular CyHnders^ and their opaque 
kernels, it is eafily feen ^ that thofe of the white Circle, 
which are diftant from the Sun at a certain angle ^ begin t© 
give paffage to his rays to ftrike our eyes , in the fame man- 
ner as hath been faid of the round half-dark Grains. That thefe 
Cylinders are thofe , which on each fide of the Sun make us 
(cQ aParhdion in the great white Circle 5 as hath been noted 
in the Obfervation of ( where they are mark'cl with K 
and N) and in many others. That thefe Parhelia have com- 
monly luminous tayles , becaufe the Cylinders^ which fol- 
low thofe fir ft ones that form iht Parhelia^zti^ which are yet fur*^ 
ther diftant from the Sun , let alfo pafs his rays to our Eye , fo 
thatthefe Tayles may be 20 degrees and more in lengrh. That 
ihe fame Parhelia are always coloured 5 becaufe they are made 
by refraiiion^ as theH^/i?. 
That befides ^ there are two other Images of the Sun ^ gene- 
ratfid 
