79 



the absence of those phenomena, by showing that a pro- 

 tective provision has always existed to prevent them. 



Mr. Ferrall went on to state, that the most beautiful por- 

 tion of this mechanism remained to be described. It was 

 one of those exquisite manifestations of design which abound 

 in the animal frame. 



In the anterior portion of this tunic were to be found 

 six different well defined openings, through which the ten- 

 dons of the muscles pass to their insertion in the sclerotic 

 coat of the eye, and over which they play as over pulleys in 

 their progress. * 



The annexed engravings, executed from original draw- 

 ings made in April, 1840, for Mr. Ferrall's clinical lectures 

 in St. Vincent's Hospital, display this conformation faith- 

 fully. 



Fig. 1, shows the tendon of the internal rectus, emerging 

 from behind the tunic, and passing through its pulley to be 

 inserted in the eyeball. 



Fig. 2, represents the eyeball drawn downwards, in 

 order to expose the exit of the tendons of the superior 



