PHYSICAL AND CHEMICAL EXAMINATION OF MILK 



203 



with a strong test-tube by means of a rubber hose. The bottle 

 is inverted and kept in this position for several hours. The dirt 

 collects in the tube, which can be removed after closing the rubber 

 hose with a pinch-cock. The dirt in the tube is then treated as 

 described above. 



Gerber used a 500-c.c. flask without a bottom, and connected 

 the neck by means of a rubber hose with a glass tube having a 

 narrow graduated end. By this process the dirt collects in the 

 graduated portion of the glass tube and can be measured. 



Fliegel introduced a new test based on principles different frorh 

 those of previous ones. The apparatus consists of a cylindric 



Fig. 76. — Sediment in 1 pint of milk at the farm. (Wisconsin Circular No. 41 .) 



vessel which rests on a piece of wire gauze covered with a layer of 

 absorbent cotton: the wire gauze, in turn, rests on a beaker or 

 similar vessel. The milk is poured into the cylinder and filtered 

 through the cotton, leaving the insoluble dirt on the cotton in 

 spots below the holes of the cylinder. Comparative estimations 

 of the quantity of insoluble dirt can be made by this method and 

 the results preserved for future reference. 



A practical apparatus for estimating suspended dirt in milk, 

 the Lorenz sediment tester, has been devised by Babcock and 

 Farrington (Fig. 74). The milk is filtered through a small pledget 

 of absorbent cotton and the cotton pasted on a clean piece of 



