T II E 



HISTORY 



A N D' 



PRESENT STATE 



Or" DISCOVERIES relating to 



VISION, L I G H T, 



A N D 



COLOURS. 



]]y JOSEPH PRIES T E E V, LL.D r.R.l>. 



liiJla Cjl i-nmcnfi cop:a vnivJi. 



OviP. 



L O X D O N, 



Printed fjr J. JOHNSON, N'=>. 72, St. Piul^ C:... .:.-V.r.]. 

 MDCCLXXII. 



I'K.. 17. 1 itle page of Joscpli Priestley's hook on l.i'^hl. which contains all knowledge 

 of linnincstence up to the lime of puhlicaiion (London. I77L'). Priesilev was a h)reiun 

 niemher of the American Philosophical SocielN. ek-cled in I7.S,'). 



