STERILISED POTATOES. 



61 



faces of the potato have thus only come in contact with the blade of 

 a knife immediately previously sterilised, and the risks of contamina- 



FiG. 19. — Growth of Micrococcus prodigiosus on sterilised potato. 

 The brilliant growth stands out very sharply from the slightly dis- 

 coloured and cracked potato. 



. ' 



Fig. 20. — Method of dividing sterilised potatoes. 



tion are minimised. The knife is now rapidly withdrawn, and the 

 bell jar replaced. 



