ANIMAL MECHANICS. 



201 



The relations be- 

 tween the fibres of 

 these muscles (as re- 

 vealed by the micro- 

 scope) are shown in 

 Fig. 44, which repre- 

 sents a portion of 

 these fibres, in the 

 iris of the Albino- 

 rabbit, ( Kolliker ) 

 magnified 350 times. 



In this figure ab 

 represents the sphinc- 

 ter, and cccc the 

 radiating fibres. 



The arrange- 

 ment of these 

 fibres shows in a 

 clear manner how 

 admirably they 

 are constructed to 

 react upon each 

 other in the man- 

 ner already de- 

 scribed. 



The sphincter 

 muscle of the eye 

 forms, also, an 

 e xcellentexample 

 of this class of 

 muscles. 



This muscle 

 00 (orbicularis 

 palpebrarum) is 

 shown in Fig. 45; 



Fig. 45- 



