168 



STUDIKS IX INDIAN SUOARCANE SEEDLINGS 



oppttsite to each in coluniii 2, uaniely. the luiiuber of seedlings havijig that 

 sucrose reading, and; in order to see the general tendency, it is necessary to 

 contract the series of classes considerably. The whole have accordingly been 

 collected into four and two classes, and this has been done in two different 

 ways. 



(1) The list has been arranged in four (and two) equal classes, these 

 classes having the same number of seedlings in order of leaf width. The 

 followint' classes are tlius obtained :- 



(2) The list has been arranged in four (and two) classes, this time separated 

 by equal differences in leaf width. The four classes obtained in this way 

 are of unequal size, the first and last being smaller, that is, having fewer seed- 

 lings in them than the second and third. The value of this classification will 

 obviously depend on whether the end classes are sufficiently large for fair 

 averages to be obtained. 



In dividing the 322 Karun seedlings into e<jual classes according to num- 

 bers, a fraction is introduced, and this becomes more inconvenient if it is 

 I instead of |, as it would be if there were 321 seedlings instead of 322, and it 

 has been usually found simj)lei'. ^\\\o^^ the total nuniher of seedlings is not 

 divisible by four, to allow the classes to overlap., this being done symmetrically. 

 Thus, if there were 321 seedlings, each of the classes would be made to overlap 

 one, that is, the last of the first class would be repeated and taken as the first 

 of the second class, and so on. There would thus be three seedlings repeated 

 and we should have four classes of 8] each. Similarly, when there are 322, 



