ERRORS ABOUT CROSSING. 87 



prosecution. As a matter of fact most improved 

 varieties obtained by crossing have been the work 

 of practical gardeners who have had little theoreti- 

 cal knowledge of botany. 



8. That crossing is such a simple process that a 

 little botanical knowledge will enable any one to 

 be immediately successful in it. On tho contrary 

 there are many sources of error and failure which 

 nothing but experience and careful attention can 

 fully overcome. 



