PHYSICALand LITERARY, ^oj* 



rallellfm of the ribs to remain the fame, 

 is a good one, to account for the dtfecl 

 of the internal intercollals between the 

 fpine and the angle of the ribs, and for 

 the deficiency of the external intercoflals 

 from where the ribs begin to turn up- 

 wards to the y?t'A77//w ; a facl which ana- 

 tomifls are now all agreed in. The ap- 

 plication of the demonllration to thispur- 

 pofe, is the intention of this paper. 



Let AB (fig. i. Tab. viii.) be the 

 fplne, CD the flernum, EFGFI, andlKLM 

 two ribs ; then £K and GM are lines in 

 the diredion of the external intercollal 

 mufcles, and FI, and HL are in the di- 

 redion of the internal intercollals.- — Now, 

 fays Bayle, if both ribs rife, the angle 

 FEI mull: be enlarged, and its hypotheneufe 

 FI, the fibres of the internal intercoftal, 

 niuft be longer : Whereas mufcles gene- 

 rally are fhortened when they a6l. — New 

 to the fpine, where the ribs cannot be 

 brought nearer at one time than another, 

 this reafoning is jaft ; and therefore the 

 internal intercoftals are not placed nearer 

 to the fpine than where the motion of the 

 VOL.L Sff ribs 



