EEKOES 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 the contrary 

 there are many sources of error and failure which 

 nothing but experience and careful attention can 

 fully overcome. 



