320 



THE FORMS OF TISSUES 



[CH. 



and the several systems conflict with and repel one another, so 

 that presently each little area becomes the seat of a double current 

 system, from its centre outwards and back again ; until at length 

 the concentration of the field becomes equalised and the currents 



Fig. 122. An "artificial tissue," formed by coloured drops of sodium chloride 

 solution diffusing in a less dense solution of the same salt. (After Leduc.) 



Fig. 123. An artificial cellular tissue, formed by the diffusion in gelatine of 

 drops of a solution of potassium ferrocyanide. (After Leduc.) 



