the Senses of Seeing and Hearing, as to their Improvements. I mean, by shewing, that this latter of Hearing is capable of all those improvements which the Sense of Seeing has receiv'd from Art, besides many more advantages that the Ear may enjoy, by the help of our Doctrine, above the Eye; all which moreover will be of as great benefit to Mankind, as any thing that Opticks have yet discover'd, if not of greater; which, with some other pre-eminencies that it has upon another Score, will happily render Acousticks the nobler Science of the two.
In order to the making good what I but now premised of the Comparison of these two Faculties of Seeing and Hearing, as to their Improvements, I observe;
That Vision is threefold, Direct, Refracted, and Reflex'd; answerable whereunto we have Opticks, Dioptricks, and Catoptricks.
In like manner Hearing may be divided into Direct , Refracted and Reflex'd ; whereto answer three parts of our Doctrine of