74 



ESTIMATION OF INSOL,UBLE} MATTER. 



milk, a very simple method is recommended by Sttitzer : 

 A heavy test tube (c, Fig. 7) is fastened air tight by 

 means of a piece of rubber tubing (b) to the mouth of a 

 milk bottle, (a). The bottle is inverted and allowed to re- 



FiG. 7. 



main in this position for some time. The particles of in- 

 soluble matter settle in the bottom and collect in (c). 

 'The connection between the test tube and bottle is then 

 shut ofif by a clamp, the test tube removed, and the con- 

 tents treated according to the method described above. 



