New York Agricultural Experiment Station. 



665 



During the season of 1911-'12, seventy-four compounded feeds 

 have been found to contain screenings and in twenty-nine of these 

 sand is present in rather large quantities. Twenty-five contain only 

 small amounts and twenty, none or only traces. No sand was found 

 in any materials free from screenings. 



Whether or not sand is deliberately added to feeds, it is evident 

 that the use of screenings accounts largely for its presence. How- 

 ever, the fact that twenty samples containing screenings were free 

 from sand goes to show that it is not a necessary part of this refuse, 

 and that if proper measures are taken it can and should be eliminated. 



The following tables give the proportion of ash, sand and silica in 

 samples containing screenings. For comparison figures are also given 

 for a few samples to which no screenings have been added. 



