20 PREFACE. 



More particular instructions for the use of this book in the study 

 of our plants are here superfiuous; as these, as well as the needful' 

 preliminary knowledge, will be acquired from the author's Introduc- 

 tion to Structural and Systematic Botany {Botanical Text-Book), or 

 from the simpler First Lessons in Botany, — one or the other of 

 which must needs be previously studied, and be the inseparable 

 companion of The Manual. 



