118 AGRICULTURE ON THE PACIFIC SLOPE 



position. Some leaves (sweet clover) take this position 

 when the light is very strong in the middle of the day. 

 The trunks of trees may suffer from ^sun scald^ 

 due to injury of the bark by the intense lightand Heat of 

 the sun ; or to the alternate thawing and freezing of 



FIG. 66. Young squash plants. Those at the left grew in the light ; those 

 at the right grew in the dark. All were planted at the same time. 



the bark on the southwest side in late winter. The 

 trouble may be prevented by shading the trunk with a 

 screen of wire, boards, cornstalks, etc. Pruning often 

 lets in too much light on the trunk, which suffers in 

 consequence (this is especially noticeable in the weep- 

 ing willow). 



