AD:\rixTrRE of dtrt 127 



greater or less dirt content has a great influence upon 

 the healthfulness and keeping quality of the milk; this 

 is enii)hasized l)y a study of the bacterial content of cow 

 dung. "Wiitlirieh and Freudenreich found this to vary 

 accoiding to the kind of feed; the bacteria in the dung 

 of cows fed with hay appeared to be most numerous; 

 1 gramme of such excrement contained 375,000,000 

 l)actoria. 



( )f course the (juantity of diit in market milk differs 

 vei-y greatly. An investigation in Hamburg showed that 

 the quantity varied from 0.0 to is;].,! milligrams per 

 litei-; on tlie a\x'i-age, there were l.'J.fj milligrams of dry 

 dirt in a litei- of milk. In other experiments, Sclmiclk in 

 ('hristiania found an average nf 11 milligrams in a liter, 

 von Hellens (Ilclsingfors) found only 1.7!'; in Berlin, 

 Renk showed the avei'age to be 10.3; in Halle, 14.!l"J; 

 in Leijisig, 3.S and in .Munich, 9.0. The maximum (|uan- 

 tity in each case was niucii greater than the a\erages 

 mentioned, although it never reached the maximum for 

 Hamburg milk. 



In Dresden the standard regarding market milk 

 states that it must not contain more than S milligrams of 

 diit per liter. 



In Denmark there are no general regulations con- 

 cerning the dirt content of milk;"" there, too, it varies 

 considerably, it is great in the milk from distillerj' fed 

 herds and less in milk delivered liy the large companies. 



■■"'In ISI)."), (he CoiK'nliayeii health commissiiui hail :iil samples of 

 milk li'^li'd for clirl. which was found in small quantity, varying be- 

 tween I and l.i milligrams per liter. 



