'(737) 
feels on the occafion of changes in the Body: taking alfo notice, 
that this manner of exprefling on's felt is the firft of Languages, 
and themo&Uwverfaly fincethereisno Nation but underftands 
it. Befides thefe itota^/figns of thePaffionsof thefoul, hedif- 
covers that there are others, that are inftitnted, by which flie can 
exprefswhatfoeverftie conceiveth. Hclhews the agreement and 
difference of feme of thefe fignesin order to make his deduction 
from thence to be undeiftood. Here he takes occafion to conflder, 
Howoftemay invent a Language $ How a man may underftand 
that of aContry, where no man underftands his 5 and then, how 
Children learn tofpeak-, admiring here the force of Reafon in 
them from their infancy, to make them difcern the fignification 
©f every word $ but what furprifes him moft of all is, the order 
they follow therein, forafmuch as 'tis altogether like that of the 
Grammar % even the Rules of this Teeming to have been learnt 
from little Children. 
Then he diftinguifhes, what it is, that the Body contributes 
to Speech; examining in a Speaker , how the Air enters into his 
Lungs^whyit makes a found in iffuing out of the Wind-pipe? 
What diverfity the M&fcles caufe in found 'i What parts ot the 
mouth are employed to make it terminate in a voice i What is the 
configuration-ef every of them in thefe different terminations f 
What is the change of the F hroat,Tongue,Teetb, Bps in all the 
Articulations? Which gives him to underftand 3 what Speed is as to 
the Body. Then he obferves the effe&, which found produces in 
the Ear and Brains of the Hearer 5 and finds, that it is by reafon of 
the Agreement , which is between the Brain and the other parts 
of every Animal, that it. can be fo differently agitated by diffe- 
rent founds. And having confidered the ufe of the Nerves, which 
communicate themfelues from the Ear to all the parts thac ferve 
to the forming of fpeech, hedifcovers the reafons of many ef- 
feds, that are thought furprifing^as to fee certain Bi ds imitating 
the fong of others, the found of our Mufical Inftruments, and 
often our very Words. 
Hence alfo he dra ws Reafons to convince him, that Brutes need 
no Soul to make a noife, nor to be moved by a voice, nor to imi- 
tate the found of our words : Whereas he finds, that in Men t he 
motion of the Parts, wihich ferve for the Voice^ or of thofe that 
ars 
