STATISTICS OF OVERCROWDING 



449 



ever have developed into a full-sized individual on account of 

 the overshadowing from the parent tree. 



In a weedy bit of lawn, where the grass had largely heen 

 killed by trampling and other disturbing causes, the writer 

 found on June 9 plants at the rate of 1032 to the square 

 foot as follows: 



Plantain (Plantago Rugelii) . 

 Grass (various species) . 

 Knotgrass (Polygonum aviculare) 

 Sorrel (Oxalis cymosa) . . 



811 



200 



18 



3 



1032 



A B 



FIG. 349. Effect of competition on radishes 



Both plants were grown from the same seed and in the same soil, planted at the 

 same time. A was one of a lot standing so close together that their tap roots 

 nearly touched one another; B had several square feet of ground to itself. 

 Ahout one-quarter natural size 



