26 CONTROL BULLETIN NO. 148 



Tonics and Mineral Supplements 



There are a considerable number of tonics, mineral supplements, and products 

 of like nature being sold to feed manufacturers, feed dealers, and farmers. Usu- 

 ally the mineral content is either quantitatively guaranteed or its presence is 

 indicated by a declaration of the mineral compounds in the list of ingredients. 



A number of samples were collected and analyzed to check the claims made 

 for the composition of these materials. In most cases it was found that our re- 

 sults substantiated the claims made. In one case cobalt and nickel compounds 

 were listed as ingredients: analysis showed the absence of any significant quanti- 

 ties of either cobalt or nickel. 



In the following table the guaranteed analysis is given opposite "G" and the 

 amount found opposite "F." 



