WHAT STRUGGLE FOB EXISTENCE is 



21] 



space, for food 

 and moisture in 

 the soil, for 

 light. We nia\ 

 consider exam- 

 ples in each of 

 these three cate- 

 gories. 



351. It' the 

 earth is filled 

 with plan!-. 



358. Thi tree baa .appropriated the food and moisture, so there must be 

 that a large area remains bare of vegetation. 



sharp competi- 

 tion for every inch of its surface. It' any good soil is 

 not populated with plants it is usually because it has re- 

 cently been moved. If the farmer does aol move or till 

 his soil frequently, various 

 plants gel a foothold, and 

 t hese plants he calls weeds. 

 I determine how much room 

 an apple t ree, orol her plan I . 



upies : i hen calculate 



how 1 1 1 1 1 * 1 1 space would be 

 required for all the seed- 

 lings of t fat t ree or plant . 

 / 'In ijiiiiiir I In population 



i I il II I/ ill' il , ///' /' s\ i lid in i 



lain ni Inr jiliinis In gain ii 

 i tot ho Id. When t he w heal 

 completely co^ ers t he 

 ground, as in Pig. '\~>~ . 

 there are do weeds to be 

 seen. 



352. Plants oj difft rent 

 Jnfiii iiinl habit may grow 









