1.473 ] 
//^^r/;/^, as to rheir improvements^, I obfer^^ 
That Vifion is tlireetold, Z>/^>^S/^efr^SW, and 'Reflex di 
anfwerable whereunto we have Optuh^ , DioptricJ^, and 
Cat op tricks. 
In like manner Hearing may be devided into Dire£l^ 
l{efi'aHed^ and l{eflexd j whereto anfwer three parts of our 
Doctrine of Acouflicks 5 which are yet namelels, tinlefs we 
call them Acoujiicks, DiacQujlic\s, and Catacoujiicks, or 
( in another fence, but to as good purpofe ) Fhonicks^ Dia^ 
phonic^, and Cataphonic^s, 
I* Dired; Vifion has been improv'd two ways ; ex par- 
te ObjecSi , and ex parte Organi vel Medij. 
I. Ex parte ObjeHi Direct 'Vifion has received advan- 
tages by the Arts of Producing, Conferving and Imitating 
Light and Colours, which are the Objeds of Vifion. 
1 . For the Art of Producing Light, we have the Fricati- 
on of all hard Bodies, that beget Fire ; elpecially of the 
Flint and Steely and inftead of the Flint, moft hafd 
Stones ( as well as the Cane ) may be us d to the fame ef- 
fedj as upon trial I have found. Add hereto the lately 
invented Phofphorus, which is a new and admirable way 
of producing a Lucid fubjiance by Art, out of a body in 
it felf not Lucid,', and therefore may not unfitly be term'd 
an Artificial produllibn of Light. 
And then of the Arc of Conferving Light, the Lapis Bo-^ 
nonienfjs is a notable inftance 5 and fo happily were the 
Sepulchral Lamps of the Ancients. 
2, As to Colours 'tis the greateft part of the Art of Cy- 
ing to be able to make and fix ( that is preferve ) them; 
and the Painters and. Limners will own it to be no fmall 
part of their Skill to be able well to Mix ( that is in effed, 
to Generate ) Colours, 
1, For Imitation of Light and Colours 'tis well known 
how far PerfpeBtve with the Art of Limning and Sha- 
dowing, have gone therein ^ which all tend fomeway to the 
Advance or Improvement of DireB Vifion, 
F 2 - Add 
