LYMPH 255 



ment that choline is present in certain nervous diseases has not met 

 with general acceptation. The fluid is secreted by the cells of the 

 choroidal fringes of the brain, and absorbed into the cerebral veins, 

 probably by way of the Pacchionian bodies. 



The aqueous humour of the eyeball is a clear fluid, alkaline in 

 reaction, of low specific gravity (1005 to 1008), and containing 

 normally but a trace of protein. It is secreted by the ciliary pro- 

 cesses of the eyeball, and absorbed by the veins of the iris and those 

 in the angle of the eye. 



