12 H. H. Love and C. E. Leighty 



After the data had ail been taken, the values for the characters used 

 in this study were placed on cards. The data for each individual were 

 placed on a separate card, each card thus representing an individual. 

 The cards were then sorted for the various frequency distributions and 

 correlation tables. This method saves much time, since it is thus made 

 possible to group the cards according to one character — such as average 

 height of plant — and then, by keeping the different groups separate, 

 to distribute them into correlation tables much more easily than two 

 characters can be distributed into correlation tables from data not thus 

 arranged. 



For the first year, 1908, there were 825 individual culms used. For 

 the years 1909, 1910, and 1912, plants were made the unit, as stated 

 above, and there were 500, 400, and 400 used for the three years, 

 respectively. The ordinary method for determining the mean, standard 

 deviation, coefficient of correlation, and coefficient of variability was used. 

 All determinations were made to the fourth decimal place and were recorded 

 to the third. The mathematical work was doubly checked, and the 

 authors feel that the constants are correct. 



REVIEW OF LITERATURE 



In recent years a number of biometrical studies have been made on the 

 small grains by various investigators. 



Waldron (1910)^ reports biometrical results for oats and wheat, but 

 the results for oats are discussed at length elsewhere in this paper and 

 need not be considered here. 



Love (1912), in a study of the question of large and small grain, reports 

 biometrical results for a pure line of wheat. These results (Table 2) 

 show that yield is associated with tall plants and with plants that produce 

 a large number of kernels. At the same time the heaviest seed is produced 

 in general on the tallest plants, on plants producing the largest number 

 of seeds, and on the heaviest-yielding plants. 



Myers (1912) made biometrical studies of a variety of wheat grown 

 on plots of different fertility. He found correlations between: (1) number 

 of culms and average weight of kernel, of .013 ±.032 on ordinary soil 

 and .301 ±.027 on sand; (2) height and average weight of kernel, of 

 .480 ±.025 on ordinary soil and .509 ±.022 on sand; (3) gross weight of 



^ Dates in parenthesis refer to " Literature cited," page 70. 



