PREFACE vii 



manner for the feeding of farm live - stock. Many 

 points have been dealt with which are not ordinarily 

 found in books on Foods and Feeding, because they 

 have an indirect if not a direct bearing on the subject. 



The writing of this book has involved much 

 laborious calculation in order to present some of the 

 tables in a form which would be readily understood, 

 as well as careful study of the reports of feeding 

 trials carried out in Great Britain, many of which 

 are specially referred to ; and although the book 

 may have many shortcomings, it is hoped that it 

 will be really helpful to the feeder of stock and at 

 the same time useful to Farm Institute students. 



In conclusion, I must express my thanks to Dr 

 Crowther for allowing me to include two very important 

 tables which he has compiled on the average composi- 

 tion of farm foods and manurial constituents of the 

 same ; also to my brother, Edward Porter, B.Sc., 

 F.A.C. (Glas.), and my colleague, Allan S. M'William, 

 B.Sc., N.D.A., N.D.D., who have given me valuable 

 assistance in revising the proof sheets, and made several 

 useful suggestions. 



I must also acknowledge with thanks the readiness 

 with which the Board of Agriculture has lent me 

 books bearing on the subject from its library. 



JOHN PORTER. 



SHIREHALL, HEREFORD, 

 February 1915. 



