364 W. S. GOCHENOUR AND HUBERT BUNYEA 



possess a temporary filterability through the bacteria-retaining 

 filter candle, but the lapse of any appreciable time between the 

 preliminary and final filtration permits a reversion of the material 

 into the original state of non-filterability due probably to coagu- 

 lation of the proteins. Unfortunately, the time required in the 

 accomplishment of this preliminary kieselguhr filtration is suffi- 

 ciently long to defeat its own purpose and for this reason the 

 kieselguhr mixture is poured directly over the filter candle 

 omitting the paper filtration entirely. The meat juice as it 

 comes from the press is cleared of the coarser particles by cen- 

 trifugalization. A small amount of kieselguhr is then added to 

 the clarified meat juice and this mixture again centrifuged. 

 After the supernatant fluid is drawn off it is again mixed with 

 a sufficient amount of kieselguhr to make a rather thick mixture, 

 approximately the consistency of butter-milk or a thin gruel. 

 It is this mixture that is poured in direct contact with the filter 

 candle. The best results will be obtained by using a minimum 

 amount of vacuum. By placing the filter candle upright in a 

 mantle, gravitation will materially assist in minimizing the 

 required amount of vacuum necessary to draw the material 

 through the filter candle into the vacuum flask. 



In the event that the filtration process cannot be carried out 

 immediately after the expression of the meat juice, some coagu- 

 lation of the proteins is apt to take place, which should be cor- 

 rected by centrifugalization just before filtering. It has been 

 noted that the finished product after passage through the bacteria- 

 retaining filter will, on standing or by application of heat, coagu- 

 late just as completely as the meat juice that has not been 

 subjected to the filtration process. 



By this process, meat juice, milk, hemolized blood corpuscles, 

 etc., may be filtered at a rate which will compare favorably with 

 the filtration of crystalloidal solutions and bouillons. 



