An Explanation of the figures. 



Fig. 9. A. An Inftance of its 

 breaking the Screw, without fepa-r 

 rating the Sucker from the Cup. 



Fig. 10. jB. An immature Milt- 

 VeiTel after Operation. 



Plate IV. Fig. 1. B. The Con- 

 fequence of cutting the lower Ex- 

 tremity of the outward Cafe. 



Fig. 2. B. The Extremity cut off. 



pig. 3. B. The Confequence of 

 cutting a fmall Slit in the Side of 

 the outward Cafe. 



Fig. 4. B. The Confequence of 

 dividing the Cafe, and cutting off 

 t|ie Screw juft below the Cup, 



Fig. 5. B. The Upper-part of the 

 Cafe which inclofes the Screw, Sucker 

 and Cup fevered from the Lower. 



Fig. 6. B. An Inftance of the 

 feeming Ligament below the Cup 

 forcing its Way thro' the' outward 

 Cafe by the Smartnefs of the Stroke, 



