204 



MILK 



white paper for comparison with standards. The efficiency of 

 the tester depends largely upon the temperature of the milk, as 

 hot milk filters more rapidly than cold milk. The Lorenz sedi- 

 ment tester is provided with a jacket to hold hot water so as to 

 keep the milk hot. The pledget of cotton is supported by a piece 



Fig. 77. Sediment from open and small-top pails. 



No. 41.) 



(Wisconsin Circular 



of wire gauze and must be of the best quality, free from fat and 

 other substances which might interfere with rapid filtration of the 

 milk. The appearance of pledgets of cotton with the accumulated 

 dirt from milk obtained under a variety of conditions is illustrated 

 in Figs. 75-79. The pledgets are pasted on clean white paper 

 and compared with standards for quantitative estimation. The 



