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 been 

 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 Riiyelii) 811 



Grass (various species) 200 



Knotgrass (JPolygonum aviculare) 18 



Sorrel (Oxalis corniculata var. slricta) 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. 

 About one-quarter natural size 



