262 RALPH S. LILLIE AND EARL N. JOHNSTON. 



DESCRIPTION OF PLATE I. 



Unless otherwise indicated the solution used for the production of the different 

 structures was a 2 per cent, egg albumen solution containing 2 per cent. KsFeCye 

 and 0.5 per cent. NaCl. In all these photographs the magnification is 32 diameters. 

 In most cases the structures were allowed to develop while in position for taking 

 the photograph, in order to avoid modifications produced by moving the preparation. 



FIG. i. Fe-ferricyanide filaments, 5 min., after placing in solution (2 per cent, 

 egg-albumin, + 4 per cent. KsFeCye + i per cent. NaCl). 



FIG. 2. Fe-ferricyanide structures, about 10 min., after growth began. 



FIGS. 3, 4 AND 5. Fe-ferricyanide filaments photographed after 10 min., i hr., 

 and 24 hrs., respectively. From the same preparation. 



