PISTORY OF THE AMERICAN MENHADEN. 



257 



ble phosphoric acid at 12| ceuts; but this meaus simply that these are 

 equitable market prices for these articles, not that nitrogen is worth 

 twice as much as soluble phosphoric acid for making crops. In the 

 future more exact valuations may be obtained from an extensive review 

 of the resources of our markets, in connection with the results of analy- 

 ses of the feed and fodder consumed on our farms. 



"The column headed ' Nutritive ratio ' in the table gives the propor- 

 tion of digestible albuminoids to digestible carbohydrates, inclusive of 

 fat.* * * * To allow of directly comparing the money value of feed- 

 ing-stufis with some universally accepted standard, the last column 

 gives a comparison with good average meadow hay taken as 1." 



Average composiiion, digestibility, and money value of feeding-stuffs, as given by Dr. Wolff" 



for Germany for 1878. 



^Except those in italics, which are American products analyzed under direction of Professor Johnson. 



Comparing the poorer foods, such as straw, cornstalks, and inferior 

 hay with a good standard food like the best hay or pasture grass, it ap- 

 pears that the great difference is that the former lack albuminoids, just 

 what bran, oil cake, cottonseed cake, and especially fish, supply. One 



* Fat and carbohydrates have, it is believed, similar nutritive functions, and it is 

 assumed that 1 part of fat equals 2.4 of carbohydrates. 

 17 F 



