PHYSICAL ann LITERARY. 447 
ART. XX. 
Remarks on the Intercoftal Mufcles, by AuEx- 
ANDER Monro, F. R. S. Profeffor of 
Anatomy in the Univerfity of Edinburgh. 
y he UVRY*, thewed the mifapplication 
of Mr Bayle’s propofed demonttration 
of the action of the internal intercoftal muf- 
cles, from his inattention to the ribs not 
keeping in the fame parallelifm when they 
are raifed, as when they are depreffed, becaufe 
of the greater motion of the lower than of 
the higher ribs ; and he took notice of the 
fame demonftration, proving equally that 
the anterior part of thefe internal intercoftals 
mutt a&t in infpiration, as Bayle would have 
their pofterior part to act in expiration: but 
a neither he, nor any other writer of my ac- 
—® quaintance, has applied this demonftration 
of Bayle’s, which, granting the parallelifm 
of the ribs to remain the fame, is a good 
one, to account for the defed of the inter- 
nal 
* Anat, raifonn, part 2. chap. Y4e 
