EXPERIMENT STATION. 429 



corn ensilage as a substitute for a part of the English hay, on 

 the cost of the production of milk. Not less striking is the 

 beneficial influence of a moderate amount of roots, as a substi- 

 tute for a part of the hay, on the quality of milk. A numeri- 

 cal expression of the influence of the yield of milk in case of 

 difi"erent cows, as well as at difierent milking periods of the 

 same cow under the same system of feeding, on the cost of its 

 production, may not be without some interest, when entering 

 upon a serious discussion of the question, What kind of cows 

 ought to be removed from our dairy stock in the interest of 

 good economy? 



