(855)^ 
not failed, hethinksit will be no difficult matter, to reduce all 
other motions in the world to that of Fermenration^and proba- 
bly CO refolve many hard Queflions , not as yet fo rightly de- 
termined. But becaufe Contemplations of this kindarejn their 
own nature, very unprofifable, if not reducible to praftife ; the 
Author hath endeavour'd to apply rhe fame to the Cure and 
Prevention of moft Difeafcs. 
IV. -A Pmlofophical tjfa^ of MUSICK i London, printed for J. 
Martyn, Frinter tothe R, Societ^y nuhe Bellin St- Faul*s 
Church y^rd, ! 6 7 7 4°. 
r~|—>His Author's defign being to explain the Nature of Mufick, 
J[_ he begins to inquire into the caufe oi Sound: (n order 
whereuarojhe confiders fjme of the chitf ph^^omem of Souftd.^s 
I. that it may be produced, according to him5 in ih^ Torricellian 
vacuity: 2. ihat it caufes motion inSolid boclies^and is diminiOi-- 
ed by the inrerpoficion of folid bodie. : 3, that if (he bodies in^ 
terpofed are very thick^icspafTage is whol y obftrufled: 4. that 
n fcem^ to come to ihe Ear in firaic lines y.hen the objefl: is fo 
fcituated that it cannot come io a ftrait li[ie to iheear: 5. that 
when the Air is not in motion, ics extent \s Jpherical ; and when 
there is a wind, the fphere is enlarged on that part, 
to which the wind blows, and diminiflied on the contrary part: 
6. that it arrives not [o the ear in an in/lant , but confiderably 
flower than fight : 7. that it comes as quick sgainft the windas 
with it, though not io loud nor fo far* 
Hence he raifes the following Hy pothefis. He fuppofes the 
Air,\ve breath in, (o be a mixture of different minute bcdies 
which are of different: forts and (Izes, though all of ihem are fo 
fmall as to efcapeour fenfes ; grofferoi them he makes Ela- 
fiical,and fuch as are refifled by folid bodies, akogether im- 
pervious to them : The fmalier parts pafs through folid bodies, 
tho not with that eafe but that upon a fudden and violent ftart 
of tben),they (hock ihe parts of folid bodies that ftand io their 
way, and alfo ihQ grojfer parts of the Air.Laftly,that there may 
be anotherdegreeofmoft/«^//7e'E//&^re4/parts,wiih which the 
interftices of thefe and all other bodies are repleat,which find 
freer paflTagc every where,and are capable of no compreffioDjand 
confequently are the medium and caufe of the immediate ccm« 
munication of Sight. 
Now, of thefe three, he efteems the middle fort to be the me- 
dium and caufeof iS'(?/^^^, and that at any time, when the grojfer 
Air is driven off any fpace, and leaves it to be poffeft by thefe 
and 
