ACKNOWLEDGMENTS 



The authors wish to acknowledge their obKgations for 

 valuable criticisms and suggestions to the following members 

 of the faculty of Purdue University : J. H. Skinner, Dean and 

 Professor of Animal Husbandry; W. C. Latta, Professor of 

 Agriculture and Superintendent of Farmers' Institutes; James 

 Troop, Professor of Entomology and Horticulture; A. T. 

 Wiancko, Professor of Agronomy; O. F. Hunziker, Professor 

 of Dairying; W. W. Smith, Assistant Professor of Animal 

 Husbandry; S. D. Conner, Instructor in Agricultural Chem- 

 istry; and Otis Crane, Instructor in Poultry. Thanks are 

 also due to Miss Sarah E. Cotton, State Department Public 

 Instruction, Indianapolis, Ind. 



Credit for cuts loaned is given either in connection with the 

 illustrations or in the List of Illustrations, for all of which the 

 authors feel themselves deeply obliged. 



M. L. Fisher. 



F. A. Cotton. 



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