cumstauces. An excess, thereioie, of any one or of all three in one 

 diet as compared with that of another counts in favor of that 

 particular diet, as far as net cost of feed is concerned ; for it is ad- 

 missible for mere practical ecouomical purposes, to assume that in 

 raising one and the same kind of animals tu a corresponding weight, 

 or feeding them lor the ^^ame purpose, :i corres;|)ondiug amount of 

 nitrogen, phosphoric acid, potassium oxide, etc., will be retained, 

 and. according to circumstances, either stored up iu the growing animal, 

 or pass into the milk, etc. The commercial value of the three aiiove 

 mentioned essential articles of plant lood, contained in the ma- 

 nure secured in counecti'ii wilh our feeding experiments with milch 

 cows, has differed in case of different diets from less than one-third 

 to moi-e than one-half of the market cost of tlie feed consumed. A 

 few tabular statements may not be without interest on this occasion ; 

 for further illustration 1 refer to our last annual report. 



I. Table showing the relative manurial value of stated fodder. 

 Net cost signifies market cost less manurial value. 



II. Tables designed to show the approximate relative cost per 

 pound of digestible nitrogenous matter of some prominent fodder 

 articles. The calculation assumes in every case a value of .9 cents 

 per pound of digestible non-nitrogenous extract matter and 4-| cents 

 for digestible crude fat. The difference between the sum of the 

 money values of fat and non-nitrogenous extract matter and cellu- 

 lose present, and the market jn'ice of the particular fodder article, is 

 charged to the digestible nitrogenous matter. The corn meal has 

 been adopted as the basis for the comparison, as far as value of non- 

 nitrogenous matter is concerned. In presenting this table, it is by 

 no means assumed that the nitrogenous matter as stated below, is 

 pound for pound, of equal nutritive value; it merely aims to show 

 what class of articles suggest themselves for trials, when an increase 

 of nitrogenous matter is the main object for consideiation in making 

 up a class suitable for the occasion. 



