52 



INTERRUPTION OF wateR EY PLANTS 



Weber (Phj'Sical Propertie»s of Soils, 119) ©stlaatea 



that m th© forests of Switzsrxand, Prussia, and '^wvaria 



trees interrupted the fallin/r moisture ^b fellows : 



L&rch 15 per cent 



Elrch 19 " " 



Spruce Fir 24 " " 

 hootch Pine 30 " •• 



When weeds eover the surface, and the rainfall is ia 

 Sffaalj. aiBOuiits, tht loss from thu? fisoi.rc® may at tiaies b® 

 yri^rY oi'-tirial. Even v.'hen the rainfall is considerable 

 th« amount intercepted ipay ov'sr^-alance the protection 

 against evaporation. 



