EXERCISE No. 11 

 WEIGHT OF EAR, AND NUMBER OF GRAINS IN BUSHEL 



Object: To determine the weight of an ear, and the 

 number of grains in a bushel of corn. 



Material : A number of average ears of corn and a pair 

 of scales that is accurate. 



Method : Weigh ten average ears of corn, one at a time, 

 each member of the class using a different sample of ten ears. 

 Count the grains by counting the rows and the number of 

 kernels in a row. These multiplied together will give the 

 number of kernels in the ear. Verify the weight by weighing 

 the ten ears together. How many ears in a bushel? How 

 many kernels? What effect does it have on the number of 

 kernels and the number of ears in a bushel if the ears are 

 large? The averages are to be made from the samples of the 

 entire class. Compare a weighed bushel with a measured 

 bushel. 



Conclusion : The average bushel of corn contains 



ears and has kernels. The aver- 

 age weight of an ear is , 



EXERCISE No. 12 

 A STUDY OF CORN ENEMIES 



Object: To learn to recognize some of the most import- 

 ant enemies of the corn crop. 



Material: A good hand lens, samples of corn smut, corn 

 root worm, corn root aphis, corn ear worm, chinch bug, 

 white grub, and other cut worms in their different stages. 



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