948 General Notes. 
which slightly hardened the tissues, the first solution was replaced 
by a second of =! per cent. In this the retina remained for three or 
water, rinsed, and transferred to Grenacher’s alcoholic borax-car- 
mine. This reagent performs both the office of a maceration fluid 
andadye. In from twelve to twenty-four hours the retinal cells 
can be isolated, and present in different regions of the retina three 
principal conditions. First, those from the exterior of the retina 
are seriously altered by the continued action of the potash ; second, 
ose from the centre of the retina remain almost unchanged, still 
