420 



Plant-Breeding 



size of r found for the data used in our problem, the correlation 

 existing between the length of plant and its number of pods is 

 not great. 



EXERCISE 4 



Statistical Study of Apples from Different Trees 



Object. To study the individuality of fruit trees. 



Materials. Apples representing the total product of different 

 trees; scales; calipers. 



Fill in the following form for each tree. Plot curves repre- 

 senting the entire population of trees. 



NAME OF VARIETY 



Tree no 



Age of tree 



Condition of tree . . . 

 Total number of apples 

 Number of marketable apples 

 Total weight of apples . . . 

 Weight of marketable apples 

 Average width of 50 apples 

 Average length of 50 apples 



Color 



Any other noticeable differences 



EXERCISE 5 

 Statistical Study of Branches of Different Trees 



Object. To continue the study as outlined in Exercise 4, 

 to test the individuality of trees. 



Materials. Fruit trees of different kinds, preferably dwarf 

 trees; tapes. 



Measure the new growth of various parts of each tree and of 

 different trees. Plot curves of each tree and of all of the trees 



