THE PREPARATION OF CULTURE MEDIA 145 



filtration and the efficiency. They are made in various forms and 

 models, some of which are shown in the accompanying figures. In 



JIG. 10. BERKEFELD FILTER. 



FIG. 11. REICHEL FILTER. 



most of the methods of filtration commonly employed the fluid which 

 is to be filtered is sucked through the walls of the filter, either by 



