[ 24 ] 
confpicuous in us; innumerable Pittances of which 
are ro be obfcrved in every other Part of the animal 
World beftdes: And even from hence we might na- 
turally conclude it abfoiutely neceffary; but the 
Structures of thcfe Parts, their fenfible Actions, and 
the great Confcnt between one Part of the Animal 
and another (from their nervous Communications), > 
yet more plainly confirm this Conclufion* 
v. 
Whatfoever Sovereignty the Diaphragm is known 
to have in Refpiration, which concerns the Circula- 
tion. of the Blood in the greateft meafure, fince the 
Seat of the Heart is formed upon that Organ in hu- 
man Bodies, I am now almoft confident, from many 
Scrutinies and Obfervations made upon it for feve- 
ral Years, that it has no fmall Share in being a prin- 
cipal Inflrument of receiving, and communicating the 
Impulfes of the Will to the feveral Parts which are 
deftined for the Expreflion or Publication of the In- 
tention of that Will or Mind: Now, in order to 
prove this, lec us only confider, that, when an Ob- 
ject of Mirth offers to us, the Laughter, or quick 
Concuffion of the Lungs, is begun by the Diaphragm 5 
which is no fooner fet in Motion, to exprefs the 
Pleafure conceived at it, than the Mufcles ferving to 
form a Smile upon the Countenance, are imme- 
diately influenced, and a gentler, or more forcible 
Drawing of the Corners of the Mouth backwards is 
excited, according to the Degree of Mirth before 
us. Now, from the firft Influence of the Diaphragm, 
when Grief is the Subject alfo, we plainly fee, that 
v the 
t 
