AMOUNT AND KIND OF DIRT IN MILK 



275 



6. Fill the tubes with physiological salt solution and mix 

 the sediment well throughout the dilution fluid with a plat- 

 inum needle. 



7. Balance the tubes and centrifuge again. 



8. Pour or pipette off the physiological salt solution. 



9. With a small platinum loop, obtain a small amount 

 of the sediment and make a smear on a clean slide. 



10. Stain with aqueous-alcoholic methylen blue. 



FIG. 60. Wizard Sediment Tester for Milk. 



11. Determine the proportions of bacteria and leuco- 

 cytes in ten fields. Also note the presence of bacteria in 

 clumps and foreign matter. 



The presence of many leucocytes and streptococci asso- 

 ciated together is generally indicative of an inflamed con- 

 dition of the udder, as in mastitis (garget). On the other 

 hand, sometimes the milk from normal udders may show a 

 considerable quantity of leucocytes in the sediment. 



