Cliap. IV.] 



THE ORBIT AND EYE. 



61 



of the sclerotic,* and thus through this somewhat 

 complicated channel the aqueous chamber is brought 

 into relation with the venous circulation. This re- 

 lation probably explains the ready absorptive powers 



of the aqueous. 

 Thus, if pus 

 finds its way 

 into the ante- 

 rior chamber 

 (hypopyon) it 

 is usually read- 

 ily absorbed. 

 The same ap- 

 plies 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 absorp- 



Fig. 10. Section of Globe, showing Iris, Lens, tioil of blood 

 Ciliary Region, etc. (After Allen Thomson.) from the vitl'6- 



a, Cornea: b, sclerotic; c, lens; d, iris; c, ciliary pro- 

 cess;/, conjunctiva; <i, canal of Sclilemm ; A, canal 



_ 

 UUo 



, 



of Fclit; f, anterior margin of vitreous humour;.?, rn^_ j. .,,+ -,,, 4- 

 choroid covered by retina ; k, aqueous chamber. 



of soft cataracts 



by the " needle operation " depends for its success upon 

 the absorptive powers of the aqueous. In this pro- 

 cedure, the lens capsule having been torn through, and 

 the cataract broken up with needles, the removal of 



* The precise manner in which these spaces communicate with 

 the neighbouring veins lias not been demonstrated histplogically. 

 The statement is founded mainly upon the experiments of 

 Schwalbe. 



