66 



EXPERIMENT STATION. 



[Jan. 



These figures, however, give only very meager information as 

 to the whole range of variation, even in the qualities studied. 

 If we wish to know the facts more accurately, we should refer 

 to the graphic presentation on pages 66, 67 and 68. 



Let us study first Fig. 1, showing the variation in length of 

 vine. The spaces along the bottom of the figure represent 

 diifcrent lengths of vine, in centimeters. The vertical spaces 



Fig. 1. 



represent the number of vines of each length, the whole being 

 represented on a percentage basis; i.e., 179 vines as 100. It 

 will be seen that in each 100 vines there were 3 having a length 

 of 20 centimeters, 8 with a length of 30 centimeters (26-35 

 centimeters), 22 with a length of 40 centimeters, 32 with a 

 length of 60 centimeters, 7 with a length of 70 centimeters and 

 2 with a length of 80 centimeters. The figure thus shows the 

 composition of the entire row (the " population," as it is tech- 

 nically called) Avith respect to height. 



One of the most important facts brought out by this gra})h 



