[ 36 ] that the Rays that head to the blue finish of the Image seventy seven and that thus fuffer the greateſt Refraction within the within the, are again in the within the additional refracted than the reſt. The ſame factor I try'd alſo by belongings the Sun's light-weight into a dark area through 2 lit- tle spherical holes F and o [in Fig. 17.] made in the Window, and with 2 parallel Priſms ABC and a By placed at thoſe holes (one at each) refracting thoſe 2 beams of sunshine to the oppoſite Wall of the Chamber, in fuch man- ner that the 2 colour'd pictures P T and MN that they there painted were joined finish to finish and lay in one ſtraight Line, the red finish T of the one touching the blue finish M of the O- ther. For if theſe 2 refracted Beams were once more by a 3rd a 3rd a 3rd to the 2 firit, refracted fideways, and also the Spectrums thereby tranſlated to ſome alternative a part of the Wall of the Chamber, ſuppoſe the Spectrum atomic number 78 to atomic number 78...