94 



A Simple, Efficient, and Economic Filter 



TABLE 3 



Data pertaining to thc soltibility of amnionium phosphomolybdate in ice-cold 

 water and in water at room-temperature 



No. of 



analy- 



sis 



Yellow precipitale 

 washed with 



Ice-cold 

 water 



Water at 



r om-tem- 



perature 



No. of 

 analy- 



sis 



Yellow precipitate 

 washed with 



Ice-cold 

 water 



Water at 

 room-tem- 

 perature 



No. of 



analy- 



sis 



Yellow precipitale 

 washed with 



Ice-cold 

 water 



Water at 

 room-tem- 

 perature 



For neutralization of the washed yellow precipitates nJ2 NaOH sol. was used 



washed with water at room temperature required 5.05 c.c. The 

 difference is so small as to be neghgible. 



SuMMARY OF GENERAL CONCLUSIONS. The papcr-pulp filtcr, 

 its preparation and use, are described in detail. 



The efficiency of the pulp filter is shown. This filter not only 

 combines the acciiracy of the best paper-filters with the rapidity of 

 the asbestos filter, but even surpasses both of them in some respects. 



The great economy of the pulp filter is demonstrated, its employ- 

 ment efTecting a reduction in the use of filter paper to less than 25 

 percent. 



The advantageous application of the pulp filter to the filtration 

 of the ammonium-phosphomolybdate precipitate is shown. 



