Appendix E 



449 



STUDY OF CORN 

 Variety : Dent, flint, sweet, pop. (Underline.) 



Where grown 

 (a) Length of ear in cm. 

 (6) Circumference of ear in cm. ( butt to 

 tip) 



(c) Weight of ear 



(d) Number of rows 



(e) Circumference of cob ( butt to tip) 

 (/) Weight of shelled corn 



(g) Weight of cob 

 (h) Percentage of shelled corn 

 (?') Total number of kernels 

 (j) Average weight of kernel 

 (k) Width of kernels in cm. (taken at ran- 

 dom) 



(I) Compute average width 

 (ra) Length of 50 kernels in cm. (taken at 



random) 

 (n) Compute average length 



EXERCISE 20 

 Study of Correlations of Characters in Corn 



Use the same data as employed in Exercises 17 and 19. Make 

 correlation tables by accepted biometrical methods of such 

 characters as length and circumference; length and number of 

 grains ; weight and number of grains ; length and weight ; etc. 

 Work out correlation coefficients. 



Object. To find out if certain characters are associated so 

 that a measurement of one will give an indication of the other. 



Materials. Data from Exercises 17 and 19 ; cross-section 

 paper. 



2c 



