SURGICAL APPLIED ANA TO MY. [Chap. iv. 



complicated channel the aqueous chamber is brought 

 into relation with the venous circulation. This relation 

 probably explains the ready absorptive powers of the 



aqueous. Thus, 

 if pus finds its 

 way into the 

 anterior cham- 

 ber (hypopyon) 

 it is usually 

 readily absorb- 

 ed. The same 

 applies to mode- 

 rate extravasa- 

 tions of blood 

 in the chamber, 

 and the speedy 

 removal of such 

 effusions con- 

 trasts with the 

 difficulty that is 

 experienced in 

 the absorption 

 of blood from 



Fig. 10. Section of Globe, showing Iris, Lens the vitreOUS 



Ciliary Region, etc. (After Allen Thomson.) chamber. The 



a, Cornea; 6, sclerotic; c, lens ; d.iris; e, ciliary process ; , , f, 



f, conjunctiva ; g, canal of Sehlemm ; h, canal of Petit ; treatment OI SOlt 

 i, anterior marpiu of vitreous humour ; j, choroid , , - ,1 



covered by retina ; k, aqueous chamber. Cataracts by the 



" needle opera- 

 tion" depends for its success upon the absorptive 

 powers of the aqueous. In this procedure, the 

 lens capsule having been torn through, and the 

 cataract broken up with needles, the removal of the 

 opaque debris is left to the aqueous, and it is not long 

 before its efficacy in that direction is seen. 



The vitreous takes little active share in ocular 

 maladies. It maybe secondarily affected in ^inflamma- 

 tion of adjacent parts, may be the seat of haemorrhages, 



