6 PREFACE. 



Oils briers. Should I have succeeded to bring you to notice that 

 rambling through field and forest after plants, implies a higher 

 purpose than the pleasure of analyzing and adding them to the 

 collection, then I would feel like the aberrant botanist, who, 

 aberrant, made a precious discovery. Remember of all, that it is 

 not for every one to penetrate into the depths of a science, but 

 that a plain and correct knowledge of the leading principles in 

 botanical science is attainable and useful to all. 



" Tngennas didicisse fideliter artes 

 Emollit mores nee sinit esse feros." 



A. GATTINGER. 



N.vsHviLKF. Tenn., Pel), p., 1887. 



