March, 1913] feeding-stuffs 17 



have been used in their manufacture. They may contain 

 any mixture of stock feed materials and therefore cannot 

 be compared with standards of average composition. They 

 often represent various industrial by-products such, for 

 example, as are obtained in the manufacture of breakfast 

 foods. 



The writers wish to here acknowledge the assistance ren- 

 dered by Llessrs. D. B. Keyes, G. P. Lane, M. H. Brog- 

 gini, G. L. Ham and H. M. Eastman in preparing the fol- 

 lowing analytical data. 



