94 Weeds. 



such grazing are winter rye and other 

 small grains, rape, corn, and sorghum. The 

 experience of the author in thus fighting 

 weeds at the Minnesota experiment station 

 was very satisfactory. 



//. Give careful attention to all modes of 

 weed distribution and propagation. It 

 was stated in Chapter IV that we cannot 

 control some of the modes by which weeds 

 are distributed, that some of them we can 

 but partially control, and that yet others 

 are completely under our control. So many 

 and so varied are the agencies by which 

 weeds come to us, and so many are the 

 means by which they are then propagated, 

 that we cannot afford to give small heed to 

 any of these agencies and means. It will not 

 suffice to concentrate our energies on keep- 

 ing weeds at bay in one direction when at 

 the same time they come to us in various 

 other directions. Such a course would be 

 about as wise as to try to keep out the wa- 

 ters of a rising tide by closing one breach 

 in the embankment while several others are 

 left open. When everything has been done 

 in this direction, weeds will still come to 

 us. When this is so, there is only one 



