28 



A STUDY OF WHEAT. 



of wheat known as Triticum vulgare, Amyleum, and Spelta seem 

 to be the most prolific in producing varieties, for from these 

 three seem to spring an ever increasing number. The char- 



Fig. 2. ' Cross Section of Clawson Wheat. X 250. 



A, First Fruit Coat ; B, Second Fruit Coat \ C, Third Fruit Coat ; D, First Seed Coat ; 

 E, Second Seed Coat ; F, Albuminous Layer. Drawn with the Camera Lucida. 



acters of the cultivated varieties of one parent-plant shows, 

 according to Darwin, a constant, striking and remarkable rela- 

 tion to the purpose for which the plant was cultivated by 

 man. The varieties of wheat differ from each other only 

 slightly in the size of the stalk, or in the form of the leaf, 



00 



Fig. 3. Starch Grains of Diehl Wheat, or Diehl Flour. Drawn 

 with Camera Lucida. X 475. 



which are of little importance to mankind ; but they show a 

 great variety and extent of difference in the form and size of 



