PROGNOSIS AND TREATMENT

be 0-02 per cent. or less-that is, normal-in seven cases of papilloedema, while in papillitis of inflammatory origin it was 0 04 and 0-10 per cent.-that is, from two to five times the normal amount. In papillitis of non-inflammatory origin due to transudation of fluid rich in albumen, as in renal retinitis, the protein content was 0*03 and 0 04 per cent.-that is, about twice the normal amount, an increase that is also definitely pathological. The protein determination of the aqueous enables the observer, therefore, to differentiate choked disc from papillitis. In the writer's opinion the clear-cut results obtained and the theoretical soundness of the principles involved warrant the use of this test as An additional aid in the differential diagnosis of papillcedema and papillitis. R. M. S.