Winifred E. I^rknchley 



167 



An interesting feature is the very gradual closing up of the range of 

 variation from the lowest (first) to the highest (fourth) quartile, when 

 compared with the sudden change from the first to the second among 

 the spaced plants. 



Fig. 10. Diagram showing the efficiency index of dry weight production for each 

 of 64 crowded barley plants in the positions they occupied during growth. 



Table XVI. 



Total Lowest 



no. of quartile 2nd 3rd 



plants 1st quartile quartile 



Upper 

 quartile 



4th 



No. of No. of No. of No. of 



plants o/ii plants "/o plants % plants % 



Outer rank 28 2 7 12 43 14 50 



Second rank 20 6 30 9 45 3 15 2 10 



Third rank 12 7 58-3 4 33-3 1 8-3 — 



Inner rank 4 3 75 1 25 _ o — 



