PREFACE. 



The widespread favor with which Feeds and Feeding, first pub- 

 lished in 1898, was received is indicated by the fact that nine editions 

 have since followed. The plates used by the printer having become 

 worn and new ones being necessary, the opportunity has been used to 

 revise, bring down to date, and entirely rewrite the book. 



In Part I the description of the processes of digestion have been 

 amplified, and the studies of Pawlow on the work of the digestive 

 glands touched upon ; the far-reaching findings of Kellner and Arms- 

 by on the energy value of food are summarized; the importance of 

 the mineral matter in food has been duly recognized; Jordan's in- 

 genious study is recited, settling at last the long debated question of 

 the carbohydrates as a possible source of fat in the milk of the cow ; 

 the Wolff feeding standards are retained because of their great help 

 to the student of both the old and the new in feeding problems; 

 Haecker's modifications of these standards for the dairy cow are pre- 

 sented; the advanced feeding standards proposed by Kellner and 

 Armsby in substitution for those of Wolff are briefly presented; also 

 the helpful Scandinavian feed-unit system. For help in this part and 

 elsewhere Kellner 's recent work, Die Ernahrung der landwirtschaft- 

 lichen Nutztiere, has been heavily drawn upon. 



In Part II the various new feeding stuffs are considered along 

 with the old. The supreme importance of combining the legume 

 roughages with Indian corn for the economical feeding of farm ani- 

 mals is duly emphasized, also the economical importance of soilage 

 and silage; and finally the vital relation of animal husbandry and 

 the manurial residue of feeding stuffs to the economical maintenance 

 of soil fertility. 



In Part III all the important findings of the experiment stations, 

 to date, on the value of feeding stuffs, obtained thru feeding trials, 

 are recorded. All tabular matter of feeding trials, both old and new, 

 is presented in an entirely new form, greatly simplified. The studies 

 of Zuntz on the relation of feed to the work performed by the horse, 

 and rations for horses as gathered by Langworthy, are presented. 

 The findings of Skinner, Mumford, and Waters on the feed require- 

 ments in beef production and the importance of the legume rough- 

 ages in the rations of fattening cattle are given merited prominence. 



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