2§ 
MiIcROGRAPHIA, 
not be found a co-efficient in the moft confiderable Operations of Na- 
ture? As inthofe.of Heat,and Light,and confequently.of Rarefaction and 
Condenfation, Hardnefs, and Fluidne/s, Perfpicnity and Opacoufnefs,Refrati- 
ous and Colours, ec. Nay,1 know not whether there may be many thin 
done in Nature,in which this may not (befaid to ) have a Finger? This 
I have in fome other paflages of this Treatife further enquiredintoand 
fhewn, that as well Light as Heat may be caufed by corrofoz,whichisap- __ 
plicable to congruity,and confequently all the reft will be but fubjequents; 
Inthe mean time I would not willingly be guilty of that Error,which the 
