first and fifth alone. Fig. 3 represents the tendons of the foot of the 

 jaguar. 



I now come to the proper subject of my present lecture, which is the 

 classification of muscles. Muscles were originally classified by Alphonso 



Fig. 3- Fig. 4. 



Borelli, who divided them into various groups ; but, as this is not an 

 historical or antiquarian sketch, I shall content myself with giving you 

 my own classification, which is based upon his, and is a considerable 

 improvement. I divide all muscles into the following ; the prismatic 

 muscle (fig. 4), where the fibres pass parallel to each other from bone 

 to bone ; the penniform muscle (fig. 5), where the fibres radiate at equal 

 angles from a common tendinous line, and are inserted, of course, at 

 each extremity into the bone ; the triangular muscle, where the muscu- 

 lar fibres proceed from a fixed line, and are inserted not into a point, 

 but into a line, so short that we may for practical purposes regard it as 

 a point ; and the fourth class I call quadrilateral muscles, where they 

 are drawn in lines converging from one bone to another. 



If A B represent one bone, and a' e' another bone (fig. 6), these bones 

 maybe curved in any way you please. In Nature, as you know, every- 



