C 3®70 ) 
taught of Sound and Hsming: Upon which 'tis inferr'd y that 
Colours are not any thing permanent in vifible things, Dot of 
themfelves lucid, when they are not illuminated / but that they 
are the Light it felf , under fome pecuhar Modification made 
fenfible by the Sight. 
L^/Z/yj This firlt part is ended with a large Difcourfe of the 
J{ainbow, its Colours and their Order, its Circular figure ^ the 
_ Conceiitricknefs of RaiiibowSj ^c. Concluding upon th.^ 
whole 3 that a Rainbow j both the Primary and Secundnry, 
is generated from the Solar rays, refleded and refraded by 
the drops of a rorid cloudy fo th<it the Prmary is reprcfented 
by the rays that are once refleded within thofe drops 5 but 
ihQSecundary^ by the rays twice reflefted , and which after a 
double ref raftion in both Cafes paf& to the Eye , placed in the 
axis oi the Rainbow. 
Second ^2LXth difpatched in Six Propoficions; in which 
the Author taketh pains notwithftanding all what he hath 
delivered before^ to abet -^^/'{/?5^//s opinion , importing, that 
Light is an Accident: -J though he diffembleth not, that that 
Philofopher feems to have fomewherc favour'd the contrary 
Opinion^ ashealfo acknowledgeth , that the Experiments 
and the Reafons thence deduced for the Subfiantiality of 
Light, approach very near to a Phyfico-Mathematical evi-» 
dence, efpecially with fuch men as have, either skilfully and 
carefully made thofe Experiments, themfelves, or attentively 
beheld them , when made by others. However, he maketh 
a fhifc to fay fomething by way of Anfwer to all the Argu* 
mentSj produced in the firjl place for the proof of Lights 
beinga Subftance : yet denying, that^ though Light were an 
Accident, it would folio Wj that Colours, call'd Permanent^ are 
fomething diftindl: from Light ^ and reliding in Bodies when 
jL/^/;^ is abfent* 
IV^ Marci 
