156 



THE planter's GUIDE. 



cannot be too often repeated or too earnestly enforced, 

 that it is hy principles drawn from nature, and elucidated 

 bj science, that any real progress can be made in an art 

 like the one under discussion, where nature and science 

 must unite in regulating the process, and art must follow 

 in the track which they prescribe. 



