

274 STATE BOARD OF AGRICULTURE. 



The studies of aeration as compared with unexposed milk and milk directly after 

 milking can profitably be presented at this stage. The percentages of carbon dioxide 

 are in unexposed milk 



80.58, 78.35, 81.75, 81.97, 80.16, 86.19; 



in milk after milking 



59.31, 55.33, 58.27, 66.1, 65.65, 53.28; 



in milk after aeration 

 over glass, 



39.08, 34.05, 38.72, 34.24, 49.63, 47.61; 



over tin 



42.11, 28.57, 23.41, 35.29, 44.78; 



over copper, 



21.43, 52.25, 43.79, 41.54, 52.63; 



through glass wool and copper sieves, 



13.33, 21.42, 31.81, 36.66. 



The averages of these are 



in unexposed milk 81.496 per cent. 



in milk after milking 59.636 " " 



in milk after aeration 



over glass 40.572 



over tin 35.832 " " 



over copper 42.328 ' 



through glass wool and copper sieves 25.805 



In the case of oxygen the percentages are, 

 in an unexposed milk, 



2.8S, 3.09, 2.69, 2.14, 1.6, 2.12; 



in milk directly after milking, 



13.79, 12.66, 14.17, 11.89, 10.96, 15.57; 



in milk after aeration 

 over glass, 



22.55, 23.4, 20.85, 22.29, 17.77, 16.66; 



over tin, 



18.61, 22.65, 25.75, 20.26, 15.48; 



over copper, 



32.34, 14.41, 16.99, 13.33, 9.21; 



through glass wool and copper sieves, 

 13.33, 21.42, 31.81, 36.66. 



The averages of these are 



in unexposed milk 2.42 per cent. 



in milk directly after milking 13.176 " 



in milk after aeration 



over glass 20.586 " " 



over tin ' 20.55 " " 



over copper 17.256 " 



through glass wool and copper sieves 25.805 " 



The residual gas has the following percentages: 

 in unexposed milk, 



16.34 18.56, 18.27, 15.89, 18.24, 11.71; 

 in milk after milking, 



26.9, 32.01, 27.56, 22.01, 23.39, 31.15; 

 in milk after aeration 



over glass, 



38.37, 42.55, 40.43, 43.47, 32.60, 35.63; 



over tin, 



39.28, 48.78, 50.84, 44.45, 39.74 ; 

 over copper, 



46.23, 33.34, 39.22, 45.13, 39.16; 



through glass wool and copper sieves, 

 60.01, 48.22, 48.19, 47.09. 



