CONTENTS Xk 



CHAPTER IV.— WHEAT. 



I. BOTANICAL RELATIONS. 



PAGE 



Wheat Genus 47 



Species of wheat, p. 47 ; Einkorn, p. 48 ; Spelt, p. 

 49 ; Emmer, p. 49 ; Common wheat, p. 5 1 ; Club 

 or square head wheat, p. 51 ; Poulard wheat, p. 

 52; Durum wheat, p. 52; Polish wheat, p. 54; 

 Spring and winter wheat, p. 54. 



IL CLASSIFICATION OF VARIETIES. 



Importance of Variety 55 



Best variety, p. 55; Variety names, p. 56; Pedi- 

 gree wheat, p. 56; Number of varieties, p. 57 ; 

 Variety characteristics, p. 57 ; Variety groups, p. 58. 



Desirable Qualities 59 



Score card, p. 60 ; Market classifications, p. 60 ; 

 Soft winter varieties, p. 61 ; Hard winter varieties, 

 p. 61 ; Hard spring varieties, p. 62 ; White varie- 

 ties, p. 63. 



III. IMPROVEMENT OF VARIETIES. 



New Varieties 6^ 



Introduction of foreign varieties, p. 6t, ; Improvement 

 by selection, p. 63 ; Varieties through crossing, 

 p. 64 ; Possibility of cross-fertilization, p. 64 ; Law, 

 p. 65 ; Importance as a method of improvement, 

 p. 65 ; Finding and testing new strains, p. 66. 



CHAPTER v.— WHEAT. 



I. CLIMATE. 



Conditions of Successful Wheat Culture . , , , 68 

 Effect of climate upon geographical distribution, 



