REFERENCES 275 



work can not be done on fresh material, heads must be collected and 

 be preserved in mice-proof boxes. If there should be an increase of 

 a single grain in every wheat head in a ten-acre field, how much 

 money would that increase mean? 



2. Throw a few of any one of these common grains in the fire and 

 watch them through a thick blue glass as they burn away. You 

 will notice a beautiful lavender flame due to the potash present in 

 the grain. You will find more potash in the bran than in the white 

 part. Burn a little bran and white flour. Note the intensity of 

 color produced by each. Explain that we need mineral matter and 

 that whole wheat bread is, for this reason among others, often pre- 

 ferred to white bread. 



3. Correlate the study of grains with geography, history, botany, 

 and arithmetic. Formerly, grains of wheat were used as a measure 

 of weight. These grains were selected from the middle of the head 

 and well dried. Do 5760 of these grains equal a pound Troy? Do 

 7000 of them equal a pound Avoirdupois? Verify as a class exercise. 

 It might be well to have the smaller pupils count out this number as 

 an exercise in number work, the weighing being done by the stu- 

 dents of Agriculture. 



REFERENCES 



Cyclopedia of American Agriculture. Bailey. 

 Cereals in America. T. F. Hunt. 

 Forage and Fiber Crops in America. T. F. Hunt. 

 Farmers' Bulletins. Washington, D. C. 



420. Oats : Distribution and Uses. 



424. Oats : Growing the Crop. 



443. Barley : Growing the Crop. 



534. Durum Wheat. 



616. Winter Wheat Varieties for the Eastern United States. 



678. Growing Hard Spring Wheat. 



