272 



STATE BOARD OF AGRICULTURE. 



VII. ANALYSES OF GAS-CONTENT OF MILK AFTER AERATION OVER TIN, COPPER AND 

 THROUGH GLASS WOOL AND COPPER SIEVES. 



It was thought advisable to test different materials in place of glass inasmuch 

 as it is well established that some metals have an influence upon oxidation. The next 

 two tables will indicate the value of aeration over tin or copper. The last table is the 

 result of an attempt to break up the drops of milk by passing the drops through 

 copper sieves and through glass wool three inches thick. The drops passing in all 

 through six feet of air before reaching the receptacle, the materials mentioned above 

 intervening. 



It was found very difficult to operate this combination of air sieves and glass wool 

 satisfactorily so as to obtain uniform results. The trouble lay in the fact that some- 

 times the drops could be thoroughly shattered and at other times small streams would 

 form. 



TABLE IV. (Over tin.) 



