1905.] 



On the Production of Intraocular Fluid. 



301 



IV. The Factors Determining Absorption of Intraocular Flv/iol. 



In the last set of experiments we determined the rate of absorption of 

 intraocular fluid at the normal intraocular pressure, and regarded this as 

 representing the rate of production of this fluid under normal circumstances. 

 In the same experiment it was possible to alter the intraocular pressure by 

 raising or lowering the reservoir, and so to determine the effect of the height 

 of the intraocular pressure on the rate of absorption. The results of two 

 such experiments are given below, and show conclusively that the rate of 

 absorption is determined, in the absence of disturbing factors which we 

 shall have to consider later on, solely by the height of intraocular pressure. 



(1) Cat, anaesthetised with Ether. While the amesthesia was maintained, a 

 small dose of morphia and curare was injected. Atropine was instilled 

 lucally into the conjunctival sac. 



B.P. in mm. Hg. 



I.O.P. iii mm. Hg. 



Rate of inflow in cubic 

 millimetres per minute. 



115 



22 







115 



30 



4 



115 



46 



7 



130 



62 



8 





Heart divided. 







22 



12 







36 



16 







46 



19 







62 



22 



(2) Cat, anaesthetised with Ether. Atropine and cocaine instilled locally into 



the conjunctival sac. 



B.P. in mm. Hg. 



I.O.P. in mm. Hg. 



Rate of inflow in cubic 

 millimetres per minute. 



124 



32 







124 



44 



5 



124 



52 



11 



110 



20 







116 



44 



10 



116 



52 



20 





Heart divided. 







52 



22 







44 



15 







20 



12 



