THE CHLOROPLAST 



Fig. 8. (a) Periodic ring formation from a 1.8 per cent solution of digitonin 

 evaporated from a drop on a glass surface. xlOO. (b) Periodic rings from 

 chloroplastin similarly evaporated from solution. X130. (c) Periodic crystalliza- 

 tion of potassium dichromate from gelatin. '140. (d) Liesegang ring forma- 

 tion obtained from saturated solution of potassium dichromate in gelatin reacted 

 with silver nitrate. XI 40. 



