[48^ 
hng the Ecchoing bodies, at unequal diftances, that they 
reflect all one way, and not one on the other by which 
means a manifold fucceflive Sound will be heard ("not 
without aftonifliment; ) one clap of the hands like many, 
one ha like a laughter, one fingle word like many of the 
fame tone and accent, and fo one Viol Uke many of the 
lame kind imitating each other. 
Furthermore, as Specula's maybe fo order'd, that by 
Refledlion they fhall make one fingle thing appear many 
diflFerent things ; as one fingle man to feem many men 
differing as to fhapeand complexion f or a company of 
men ) which I think Sir Samuel iMor lands contrivance does 
not ; So may Eccboing Bodies alfo be order'd, that from 
any one Sound given, they (hall produce many Ecchoes, 
different both asto their Tone and Intenfwn. ( The ground 
whereof has elfewhere been laid down in a Treatife con- 
cerning i^/'^ Sympathy of Lute-St rings.) 
By this means aM2^l?^:^/7^oc?;72 may be fo contrived, that 
not only one Inftrument , played on in it (liall feem ma- 
ny of the fame fort and fi^e ; but even a Confort of 
( fomewhat ) different ones; only by placing certain Ec- 
cboing Bodies {oj as that any Note f play'dj fhall be re- 
turn d by them in 3"^' y'^'and 8'^', which is poffibleto be 
done otherwise then was mention'd before in J^frafled 
Audition, 
I have now done with my Comparifon of the two No- 
bleft Se?ife J 2inA. Sciences a$ to their Improvements, where- 
in I have been thus large, that I might give you a little 
profpe£tinto the Excellency zxk^VJ fulnefs of Acoujlichs^ 
and that thereby I might excite all that hear me, to 
bend their thoughts towards the making of Experiments 
for the com pleating this { yet very imperfe(9:, though no- 
ble j Science, a Specimen whereof I will give you in three 
Problemes , and then prefent you with the Semiplane of 
an Acouflic\or Pbonical Spbear, as an attempt to expli- 
cate-the great Principle in this Science, which is The Pro- 
grejjion of Sounds, . The 
