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operation ; the needle pierces the fclcroticn, we behold it, througlj 

 the pupilla, lodged in the cryftalline ; the furgeon endeavours 

 to difengage and remove the catarad; it fecms in part obedient 

 to the needle; as it is prcflcd down the iris feems to fallow it, 

 but lighten the force, and every part afTnmcs its former place and 

 appearance 5 you renew your endeavours, and on preffing the 

 cataract below the pupilh, and retaining it there awhile with 

 the needle, the diaphanous vitreous humour follows it, and for 

 the inftant enables the patient to fee objeds ; the needle is now 

 carefully withdrawn, and all parties congratulated on the fuccefs 

 of the operation. It is however but tranfitory, for the parts 

 return to their former fituation, and any violence done to the 

 vitreous membrane is removed before the eye is again opened. 

 Let us fuppofe in the firfl: inftance that the operator fees the 

 cryftalline rifing: perfuaded that this is occafioned by its adherences, 

 he freely pricks and wounds the procefTus ciliares, which are the 

 internal parts of the iris, to break this cohefion ; the hemorrhage 

 difturbs his plan by deftroying the tranfparency of the aqueous 

 humour, and he withdraws his needle re t'nfe&d; or if he per- 

 feveres, he may have the credit of deftroying the eye in forming 

 this feparation. Here are in one view colleded all the proofs, 

 and melancholy ones they are, of an adherent catarad ; but the 

 defcription already given will clearly explain them. It is to be 

 remembered, that the opaque cryftalline has a lodgment formed 

 for itfelf in the anterior part of the vitreous humour ; that it is 

 furrounded on every fide by a ftrong membrane, which is a! 

 continuation of that which covers the anterior part of this laft 

 body; that the procefTus ciliares being the infide of the i.Ws 



adhere 



