\ 



\ 



Fig. 3. Binding of ferritin to surface coat at pf 1 4. I'he specimen w as washed 

 for 2 min. at pH 6 • 5 ; most of the ferritin has been removed. 



^.^ 



^^ 



M 

 ^P^ 



M 



i 



Fig. 4. Binding of methylated ferritin to surface coat at pH 4. The binding 

 persists after washing at pH for 5 to 10 min. 

 VOL. 11. — 2R 



